HVAC Ducting

Select material based on airflow needs, durability, and environment: galvanized steel or aluminum for permanent, high-strength runs; flexible insulated ducts for tight or short retrofit runs; and spiral-wound or PVC-coated options where corrosion resistance is needed

Duct diameter and cross-sectional area determine airflow and static pressure; undersized ducts increase noise and reduce efficiency, while oversized ducts add cost and space. Use manufacturer duct-sizing charts or consult an HVAC professional to match CFM requirements and minimize pressure drop

Essential tools include snips or aviation shears, sheet metal screws and a screw gun, duct tape and foil seam tape, sealing mastic, a crimping tool for fittings, and a support system like hangers or straps; specialized items like a duct stretcher or insulation cutter help for larger jobs

Seal all joints and seams with UL-classified foil tape or mastic to prevent leaks, then insulate exposed ducts with the appropriate R-value flexible duct insulation or foam board to reduce heat loss/gain and condensation; ensure insulation is vapor-barrier rated for the installation location

Follow local building codes for fire dampers, clearance to combustion appliances, and materials; wear PPE (gloves, eye protection, masks) when cutting or handling insulation and metal; and ensure airtight connections and proper supports to meet mechanical code requirements

Inspect ducts annually for leaks, disconnected sections, and insulation damage; clean or replace filters regularly to reduce dust buildup, and schedule professional duct cleaning or sealing if you detect persistent airflow or air quality issues

Prices vary by material, size, and complexity: budget components and flexible ducts can be under $50, common metal sections and fittings are often in the $25–$200 range each, and full-system materials plus labor increase total project cost; average standalone products in this category tend to be around $70–$80