HVAC Duct and Insulation Material
Introduction:
Duct is an important part in HVAC system, which is a passage or conduit used to deliver and remove air. Ducts are essentially the distribution network of an air conditioning system and ventilation fan system, ensuring that conditioned air reaches different rooms or zones in a building. Sometimes, ducts are used with insulation materials.
Materials and Forms:
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The duct material we supply can be stainless steel, galvanized steel, Phenolic color steel, aluminum, fiberglass, or flexible plastic over a metal coil (flex ducts).
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We supply ducts with the following forms:
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Raw materials such as steel sheet, steel coil, etc. (Advantages: Less transportation costs and almost no damage rates; Disadvantages: Requires on-site processing).
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Semi-finished products such as formed duct sections. (Advantages: Save transportation costs and save time; Disadvantages: Requires on-site assembly and There is a certain damage rate).
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Finised products. (Advantages: Save time; Disadvantages: There will be damage happens and expensive transportation costs).
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Types and Shapes: ​
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Supply ducts – deliver conditioned air from the HVAC unit to rooms.
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Return ducts – pull air from rooms back to the HVAC system for reconditioning.
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Exhaust ducts – expel stale or contaminated air outside.
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Shapes: Rectangular, round, or oval.
Application in HVAC:
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​Purpose: Distribute supply air, return air, and exhaust air with ventilation fans.
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For duct AC.
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For air source central AC system such as air-cooled chillers.
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For heat pump system that need heating air.
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For packaged central AC such as Rooftop AC, AHU, etc.
What Information We Need?
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Project & System Information
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Type of HVAC system (central AC, heat pump, furnace, etc.)
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Application (residential, commercial, industrial)
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Air volume (CFM / m³/h) required
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Duct Specifications
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Duct type: supply, return, or exhaust
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Shape: rectangular, round, or oval
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Size/Dimensions: width × height (rectangular) or diameter (round)
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Length of duct runs
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Thickness (gauge) of sheet metal or material (e.g., GI sheet, aluminum, stainless steel, duct board, flex duct)
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Material & Construction
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Material (galvanized steel, aluminum, stainless steel, fiberglass board, flexible duct, etc.)
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Surface finish (plain, painted, powder-coated, Phenolic color?)
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Sealing method (TDC/TDF flanges, slip joint, etc.)
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Insulation requirement (internal / external, thickness, material type)
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Performance Requirements
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Pressure class (low, medium, high pressure duct)
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Air velocity range
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Temperature and humidity conditions (important for insulation choice)
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Acoustic requirements (if noise reduction is needed)
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Accessories & Fittings
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Dampers (volume control, fire damper, smoke damper)
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Access doors (for cleaning/maintenance)
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Connectors (flanges, gaskets, hangers)
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Flexible connectors between duct and equipment
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Installation & Logistics
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Site dimensions / space limitations (to avoid conflicts with beams, ceilings, etc.)
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Delivery requirements (flat packed, pre-assembled, etc.)
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Standards to follow (SMACNA, DW/144, ASHRAE, etc.)
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