AIR DEVICES
Supply, Selection, Installation & Maintenance of All HVAC Air Devices
Mosameng Engineering (Pvt.) Ltd. | Pakistan
Where Engineering Meets the Occupied Space
An HVAC system is only as effective as the devices that connect it to the spaces it serves. Chillers, AHUs, and ductwork may represent the bulk of a project’s capital value but it is the air devices at the terminal end of the system that determine what occupants actually experience. A room that is too draughty, too noisy, unevenly tempered, or poorly filtered is a direct consequence of incorrect air device selection, poor placement, or inadequate maintenance regardless of how well the upstream plant is engineered.
At Mosam Engineering (Pvt.) Ltd. we treat air devices not as commodities to be sourced at the lowest price, but as precision components that must be selected, sized, and positioned with engineering rigor. Our HVAC engineers apply recognized aerodynamic and acoustic criteria to every air device specification, ensuring that the correct product reaches the correct location delivering the airflow performance, thermal comfort, and indoor air quality that the design intends.
We supply, install, commission, and maintain the full range of HVAC air devices for residential, commercial, and industrial projects across Pakistan working with internationally certified manufacturers and adhering to ASHRAE, CIBSE, and SMACNA standards on every project.
About Us
Excellence in Every Degree delivering precise, reliable, and high-performance engineering solutions.
Mosam Engineering is Pakistan’s premier HVAC and engineering solutions provider, delivering excellence for over 20 years. Since our establishment in 2007, we’ve built a trusted reputation for quality, innovation, and customer satisfaction across residential, commercial, and industrial sectors.
HVAC
HVAC Installation & Services
Project Design
Project Design & Planning
Engineering Solutions
Interior Engineering Solutions
Contracting
Contracting & Management Services
Our Air Device Services
Mosam Engineering provides a complete range of HVAC air device services across Pakistan covering supply, selection, installation, commissioning, and ongoing maintenance of all terminal air distribution components.
Air Diffusers
Ceiling, slot, swirl, jet, and floor-mounted diffusers for precise air delivery
Air Grilles
Supply, return, transfer, and architectural grilles for all building types
Dampers
Volume control, motorised, fire, smoke, backdraft, and pressure relief dampers
Louvers
Weather, acoustic, hurricane-resistant, and plant room ventilation louvers
VAV Boxes
Pressure-independent variable air volume boxes with DDC controls and BMS integration
Air Filters
Full filtration range from coarse panel filters to HEPA and UV-C germicidal systems
System TAB
Testing, Adjusting, and Balancing of all air distribution systems
Air Device Replacement & Upgrades
Surveys, targeted replacements, and performance improvements
VAV Boxes
Pressure-independent variable air volume boxes with DDC controls and BMS integration
Air Diffusers
Delivering conditioned air with precision comfort without draft, performance without noise.
Air diffusers are the primary terminal devices through which conditioned air enters an occupied space. Their function is not merely to deliver air it is to induce sufficient mixing with room air so that the supply air reaches the occupied zone at the correct temperature and velocity without creating drafts, stratification, or uncomfortable cold spots.
Diffuser selection is a technical exercise that must account for airflow rate, throw distance, ceiling height, room geometry, and acoustic requirements. Mosam Engineering’s engineers select every diffuser type and size using validated performance data, not rule of thumb.
Types of Air Diffusers We Supply and Install
- Square and rectangular ceiling diffusers—four-way, two-way, and one-way discharge patterns
- Round ceiling diffusers for circular airflow distribution
- Linear slot diffusers for architectural installations and perimeter heating/cooling
- Swirl diffusers for high-ceiling applications and displacement ventilation
- Jet diffusers for long-throw applications in atriums, sports halls, and large open spaces
- Floor-mounted and low-level diffusers for underfloor air distribution (UFAD) systems
- Nozzle diffusers for variable airflow in VAV systems
- Perforated face diffusers for concealed ceiling installations
Key Selection Criteria We Apply
- Neck velocity and face velocity calculations for noise-free operation
- Throw and drop analysis using manufacturer performance data and ASHRAE recommendations
- Temperature differential and entrainment ratio verification
- Acoustic NC/NR rating selection for noise-sensitive environments
- Aesthetic compatibility with ceiling types—exposed, concealed, and modular grid
For critical environments such as hospital operating theaters, pharmaceutical cleanrooms, and high-specification corporate offices, Mosam Engineering specifies diffusers with validated airflow patterns and certifiable performance data ensuring both comfort and compliance with indoor environment standards.
Air Grilles
The interface between your duct system and your occupied space selected for performance, finished for appearance.
Air grilles serve dual functions in an HVAC system: supply grilles introduce conditioned air into a room, while return and exhaust grilles facilitate the removal of stale or recirculated air. Although grilles may appear to be simple products, incorrect selection—wrong face velocity, inadequate free area, mismatched blade angle, or poor placement—leads to noise, draft complaints, uneven air distribution, and energy inefficiency. Mosam Engineering specifies every grille based on its precise application and performance requirements.
Types of Air Grilles We Supply and Install
- Fixed blade supply grilles—single and double deflection for directional airflow control
- Adjustable blade grilles for flexible airflow direction adjustment after installation
- Return air grilles—fixed core for low-velocity extract applications
- Transfer grilles—for cross-zone air movement and pressure equalisation
- Door undercut and door grilles for passive air transfer between rooms
- Eggcrate grilles for high free area return air and filter access applications
- Bar grilles and T-bar grilles for exposed ductwork and industrial installations
- Architectural linear grilles for high-end residential and hospitality applications
Material and Finish Options
We supply air grilles in a range of materials and finishes, including powder-coated steel, anodized aluminum, and stainless steel selected to match the architectural specification and the environmental conditions of the installation. In coastal environments such as Karachi, where salt-laden air accelerates corrosion, we recommend marine-grade aluminum or stainless steel grilles to ensure long service life without surface degradation.
Dampers
Controlling airflow, protecting life safety, and enabling zoning the critical control points of every duct system.
Dampers are mechanical devices within ductwork systems that regulate, balance, or shut off airflow. They range from simple manual volume control dampers used during system balancing to motorized control dampers integrated with building management systems to fire and smoke dampers that form part of a building’s life safety infrastructure. Mosam Engineering specifies, supplies, and installs the complete range of damper types and understands the critical distinction between each category in terms of both function and regulatory compliance.
Types of Dampers We Supply and Install
- Manual volume control dampers (VCDs) for airflow balancing during commissioning
- Motorised control dampers BMS-integrated for automated zone control and scheduling
- Fire dampers intumescent or fusible link type, rated to BS EN 1366-2 and local fire codes
- Smoke dampers actuator-operated, connected to fire alarm systems for smoke compartmentation
- Combined fire and smoke dampers for multi-function protection in high-rise and complex buildings
- Backdraft dampers gravity or spring-operated to prevent reverse airflow
- Pressure relief dampers for static pressure management in sealed or pressurised spaces
- Splitter dampers for proportional airflow distribution at duct branches
Fire and Smoke Damper Compliance
Fire and smoke dampers are life safety devices, and their correct specification, installation, and ongoing maintenance are both a regulatory requirement and a moral responsibility. Mosam Engineering installs fire and smoke dampers strictly in accordance with BS EN 1366, manufacturer instructions, and local fire authority requirements. Every installation is documented with the damper schedule, location record, and commissioning test certificate and we provide structured maintenance programs to ensure these critical devices remain functional throughout the building’s operational life.
Damper Maintenance and Testing
- Annual functional testing of all motorised and fusible link fire dampers
- Smoke damper actuator inspection and operational verification
- Replacement of failed or seized dampers with certified equivalents
- Full maintenance records provided for regulatory compliance and insurance purposes
Louvers
Protecting your building envelope weatherproof, secure, and aerodynamically engineered.
Louvers are the first and last point of contact between an HVAC system and the outside environment. Fresh air intake louvers, exhaust discharge louvers, plant room ventilation louvers, and equipment enclosure louvers must perform reliably in Pakistan’s challenging outdoor conditions resisting wind-driven rain penetration, blocking birds and insects, managing sand and dust ingress, and providing the required free area for airflow without creating excessive pressure drop.
Selecting the wrong louver inadequate weather resistance, insufficient free area, or unsuitable blade profile results in water ingress, contaminated supply air, blocked filters, and reduced system performance. Mosam Engineering specifies and installs louvers with the aerodynamic and weather performance data to match the application.
Types of Louvers We Supply and Install
- Weather louvers drainable blade profile for rain defence on fresh air intakes
- Acoustic louvers attenuating blades to reduce noise transmission through building facades
- High-performance hurricane- and sand-resistant louvers for extreme environmental conditions
- Combination louvers with integrated bird and insect mesh
- Architectural louvers concealed fixing for high-specification facades
- Jet fan discharge louvers for car park ventilation systems
- Plant room ventilation louvers for generator rooms, electrical switchrooms, and mechanical rooms
- Fixed and adjustable blade louvers for fresh air and exhaust applications
Selection and Sizing Criteria
- Free area calculations to achieve required airflow without exceeding pressure drop limits
- Water penetration resistance testing data—particularly critical for Karachi’s monsoon conditions
- Wind load structural sizing for high-level and high-wind-exposure installations
- Material specification—powder-coated aluminium, galvanised steel, or stainless steel based on environment
- Coordination with facade and architectural drawings for correct positioning and flashing details
VAV Boxes
Intelligent zone-by-zone control matching supply air precisely to real-time demand.
Variable Air Volume (VAV) boxes are the control heart of modern energy-efficient central air conditioning systems. By modulating the volume of conditioned air delivered to each zone in response to the actual thermal load rather than supplying a fixed volume regardless of demand VAV systems eliminate the energy waste inherent in Constant Air Volume (CAV) systems and provide far more precise zone-by-zone temperature control.
VAV systems are the preferred choice for large commercial office buildings, educational institutions, government facilities, and any multi-zone building where occupancy patterns vary significantly across different spaces and times of day. Mosam Engineering designs, supplies, and commissions VAV systems with the engineering precision that this technology demands from box sizing and controller configuration to BMS integration and system balancing.
Types of VAV Boxes We Supply and Install
- Single duct VAV boxes—pressure-independent, with DDC controllers for BMS integration
- Dual duct VAV boxes—mixing hot and cold air streams for precise temperature control
- Fan-powered VAV boxes (series and parallel)—for perimeter zones and areas requiring constant airflow
- VAV boxes with electric or hot water reheat coils for heating-dominated zones
- Cooling-only VAV boxes for interior zones with stable thermal loads
- Low-leakage VAV boxes for applications requiring precise flow control
VAV System Engineering and Commissioning
- Zone-by-zone airflow calculation—minimum and maximum flow rates based on occupancy and thermal load
- Box sizing using pressure-independent performance data
- DDC controller programming and BMS integration (BACnet, Modbus)
- Duct static pressure reset control strategy for fan energy optimisation
- Commissioning and TAB (Testing, Adjusting, and Balancing) of all VAV boxes
- Ongoing maintenance, including actuator inspection, flow sensor calibration, and controller updates
A VAV system that is incorrectly designed, poorly commissioned, or inadequately maintained will fail to deliver either the comfort or the energy savings it promises. Mosam Engineering’s commissioning engineers verify every VAV box against its design airflow rate using calibrated instruments—ensuring the system performs as specified from the first day of operation.
Air Filters
The front line of indoor air quality protecting occupants, equipment, and energy efficiency.
Air filters are among the most underappreciated components in an HVAC system—and among the most consequential when neglected. A correctly specified and regularly maintained filtration strategy protects occupants from airborne particulates, allergens, bacteria, and contaminants; protects HVAC equipment from fouling and premature failure; and maintains system airflow and energy efficiency. In Pakistan’s urban environments, where outdoor PM2.5 and PM10 levels frequently exceed WHO guidelines, a robust filtration strategy is not optional—it is a direct occupant health measure.
Air Filter Types We Supply and Install
- G3 / G4 coarse panel filters—primary pre-filtration for dust and large particles
- M5 / M6 medium filters—intermediate filtration for pollen, mould spores, and coarse dust
- F7 / F8 / F9 fine filters—high-efficiency filtration for fine dust, bacteria, and combustion particles
- HEPA H13 / H14 filters—near-total particulate removal for hospitals, cleanrooms, and laboratories
- Activated carbon filters—adsorption of volatile organic compounds (VOCs), odours, and chemical gases
- Electrostatic filters—rechargeable, washable filters for medium-efficiency applications
- Bag filters (pocket filters)—high dust-holding capacity for commercial AHU applications
- UV-C germicidal irradiation units—inactivation of airborne bacteria, viruses, and mould spores
Filter Selection and Application
Filter selection must be matched to the application, the upstream and downstream equipment, and the required indoor air quality standard. Specifying a filter that is too coarse fails to protect occupants and equipment. Specifying a filter that is too fine without verifying that the AHU fan has sufficient static pressure to overcome the added resistance results in reduced airflow, poor comfort, and increased energy consumption. Mosam Engineering selects filters based on the full system pressure budget, the AHU fan curve, and the target air quality classification.
Filter Maintenance Programmes
- Scheduled filter replacement based on pressure differential monitoring or fixed intervals
- Filter condition inspections at every maintenance visit
- Filter upgrade recommendations where IAQ improvements are required
- Disposal of used filters in accordance with applicable waste management regulations
- Filter change records maintained as part of full HVAC maintenance documentation
Clogged or overdue filters are one of the most common causes of reduced HVAC system performance, increased energy consumption, and poor indoor air quality in Pakistani commercial buildings. Mosam Engineering’s maintenance programs include filter management as a core deliverable—ensuring filters are never left in service beyond their effective life.
Additional Air Device Services
System Testing, Adjusting, and Balancing (TAB)
Supplying and installing the correct air devices is only half of the equation. The system must be tested, adjusted, and balanced after installation to verify that every diffuser, grille, and VAV box is delivering the design airflow rate. Mosam Engineering provides comprehensive TAB services using calibrated anemometers, pitot tube traverse equipment, and digital flow hoods—producing a full commissioning report that confirms system performance against design intent before handover.
Air Device Replacement and Upgrades
Older buildings across Pakistan frequently have air distribution systems with outdated, damaged, or incorrectly sized air devices that compromise comfort and energy performance. Mosam Engineering conducts air device surveys on existing buildings, identifies underperforming components, and implements targeted replacements and upgrades—delivering measurable improvements in comfort and airflow consistency without the need for major ductwork modifications.
Acoustic Assessment and Noise Remediation
Noise from HVAC air devices is one of the most frequently reported occupant complaints in commercial buildings. High face velocities, incorrectly sized diffusers, resonating grilles, and turbulent airflow at damper blades all generate noise that disrupts productivity and undermines occupant satisfaction. Mosam Engineering conducts acoustic assessments of HVAC air distribution systems and implements targeted remediation—including diffuser replacement, velocity reduction, and acoustic lining—to bring noise levels within acceptable limits.
Certified
Certifications & Registrations
Recognized and certified by leading industry standards
ISO Certified
Quality Assured
Licensed Contractor
Industry Approved
How Our Air Device Process Works
Every air device project at Mosam Engineering follows a clear and structured process from first contact to final handover and ongoing maintenance.
- Site Assessment Our engineers visit your site, review your existing HVAC system and ductwork, and gather all technical requirements, including airflow rates, room dimensions, ceiling types, and acoustic criteria.
- Custom Design & Proposal We prepare a detailed air device schedule, product specifications, and a transparent quotation with no hidden costs including layout drawings and recommended product data sheets.
- Supply & Installation Our certified technicians install all air devices to ASHRAE, SMACNA, and manufacturer standards with minimal disruption to your building operations.
- Testing, Adjusting & Balancing Every diffuser, grille, damper, and VAV box is tested and balanced against design airflow rates using calibrated instruments before handover.
- Handover & Documentation We provide a full air device schedule, commissioning and TAB report, maintenance log, and product warranties with operator guidance on filter change intervals and damper testing requirements.
- Ongoing Maintenance & Support Structured maintenance programs covering filter replacement, damper testing, TAB verification, and emergency support keep your air distribution system performing at its best.
Speak to Our Air Device Specialists Today
Whether you are specifying air devices for a new construction project, investigating comfort or noise complaints in an existing building, upgrading your filtration for better indoor air quality, or ensuring your fire and smoke dampers are compliant and operational Mosam Engineering has the expertise to deliver the right solution.
Contact our team to arrange a consultation or site survey. We will assess your requirements, review your existing system where applicable, and provide detailed, no-obligation recommendations with honest technical advice and accurate product specifications.
Why Clients Across Pakistan Choose Mosam Engineering
- Engineering-Led S—never Every air device is sized and selected using validated performance data—never based on price alone
- Whole-System Thinking: We select air devices in the context of the full HVAC system—fan curves, duct pressure, room acoustics, and IAQ
- Life Safety Compliance: Fire and smoke dampers are installed, documented, and maintained to BS EN 1366 and local fire authority requirements
- IAQ Expertise: Our filtration recommendations are driven by occupant health requirements and Pakistan’s outdoor air quality conditions
- Full Project Delivery: Supply, installation, commissioning, TAB, and ongoing maintenance—all under one roof
- Documented Handover: Every project includes an air device schedule, commissioning report, and maintenance log
- Nationwide Coverage: Active across Karachi, Lahore, Islamabad, Rawalpindi, Peshawar, Faisalabad, Multan, and beyond
- AMC and Maintenance Support: Structured maintenance programmes covering filter management, damper testing, and TAB verification
Areas We Serve Across Pakistan
Mosam Engineering provides HVAC air device services across all major cities and industrial zones throughout Pakistan.
- Karachi—Commercial, industrial, and residential air device projects including coastal-grade corrosion-resistant specifications
- Lahore—Corporate offices, manufacturing facilities, hospitals, and educational institutions
- Islamabad & Rawalpindi—Government buildings, data centres, embassies, and commercial developments
- Peshawar—Industrial and commercial HVAC air device installations
- Faisalabad—Textile and manufacturing sector air device and filtration solutions
- Multan—Commercial and residential HVAC air device services
- Quetta—Industrial and commercial climate control air device projects
• Nationwide—Industrial zones, infrastructure projects, and remote site installations across Pakistan
Frequently Asked Questions
What HVAC air device services does Mosam Engineering provide?
Mosam Engineering provides a complete range of HVAC air device services in Pakistan including supply, selection, installation, and maintenance of air diffusers, grilles, dampers, louvers, VAV boxes, and air filters. We also provide system Testing, Adjusting, and Balancing (TAB), acoustic assessments, and air device upgrade programs for existing buildings.
Why is correct air device selection so important?
Incorrect air device selection leads directly to draught complaints, uneven temperatures, excessive noise, poor indoor air quality, and higher energy bills regardless of how well the upstream HVAC plant is designed. Mosam Engineering selects every air device using validated engineering data, ensuring the system delivers the comfort and performance the design intends.
Do you install fire and smoke dampers and ensure compliance?
Yes. Mosam Engineering installs fire and smoke dampers in strict accordance with BS EN 1366, local fire authority requirements, and manufacturer specifications. Every installation is documented with a damper schedule, location record, and commissioning test certificate. We also provide structured annual maintenance and testing programs to keep these life safety devices fully operational.
What air filter grades do you supply and install?
We supply and install the full range of filter grades from coarse G3/G4 panel filters through to HEPA H13/H14 for hospitals and cleanrooms, as well as activated carbon filters for VOC and odor control, UV-C germicidal units, and bag filters for commercial AHU applications. Filter selection is always matched to the application, the AHU fan capacity, and the required indoor air quality standard.
What is Testing, Adjusting, and Balancing (TAB), and do you provide it?
TAB is the process of measuring and adjusting airflow at every terminal device diffuser, grille, and VAV box to confirm that the system is delivering the design airflow rates throughout the building. Mosam Engineering provides comprehensive TAB services using calibrated instruments and produces a full commissioning report confirming system performance against design intent before handover.
Can you survey and upgrade air devices in an existing building?
Yes. We regularly conduct air device surveys on existing buildings across Pakistan, identifying devices that are incorrectly sized, damaged, or outdated. We then implement targeted replacements and upgrades that deliver measurable improvements in comfort, air distribution, and noise levels without requiring major ductwork modifications.
How do I get a quote for air device services in Pakistan?
Simply contact our team through our website or call our office directly. Our engineers will arrange a site visit or review your project drawings, assess your requirements, and provide a detailed and transparent quotation with a clearly defined scope of work at no obligation.
What Our Clients Say
Mosam Engineering is a trusted HVAC air device specialist in Pakistan—delivering outstanding results for clients across every sector and every major city.
Salman Raza
Project Director, Corporate Development, Karachi
“Mosam Engineering handled the complete air device package for our new corporate headquarters in Karachi—diffusers, grilles, fire dampers, and VAV boxes across 8 floors. Every device was correctly sized and professionally installed, and the TAB report was thorough and detailed. Excellent engineering team.”
Nadia Karim
Facilities Manager, Financial Institution, Lahore
“We had persistent noise complaints from staff in our Lahore office due to undersized diffusers and high face velocities. Mosam engineers conducted a full acoustic assessment and replaced the problematic devices with correctly sized alternatives, and the noise issue was completely resolved. Very professional service.”
Dr. Tariq Hussain
Engineering Manager, Pharmaceutical Manufacturing, Islamabad
“Our pharmaceutical facility in Islamabad required HEPA filtration and validated airflow patterns in the production areas. Mosam Engineering specified and installed the correct diffusers and filter banks to GMP standards, with full documentation and commissioning certificates. We rely on them for all our critical HVAC work.”
Imran Sheikh
Plant Manager, Textile Manufacturing, Faisalabad
“Mosam manages our Annual Maintenance Contract for all HVAC air devices across our Faisalabad textile complex. Filter changes, damper testing, and TAB checks are always carried out on schedule with detailed reports. Their team understands the demands of an industrial environment and delivers accordingly.”
Contact Us
Get Started Today
Ready to experience Pakistan’s best HVAC and engineering services? Contact us for a free consultation and quote.
24/7 Emergency Service
Available anytime, anywhere in Pakistan
Average response time: 2 hours
Service Areas
- Lahore
- Islamabad
- Multan
- Gujranwala
- Karachi
- Faisalabad
- Rawalpindi
- Peshawar
Head Office Information
Phone
- Tel: +92 51 610 1862
- Cell: +92 321 5000 174
- WhatsApp: +92 0300 8506837
- awan@mosameng.com
- ashraq313@gmail.com
Address
Mosam Engineering, D-13, Iqbal Boulevard,
DHA Phase-2, Islamaba
Business Hours
- Mon - Sat: 8:00 AM - 6:00 PM
- Sunday: 10:00 AM - 4:00 PM
