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 HVAC 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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