Caulking Compounds: While not especially created for HVAC applications, selected caulking compounds can be used to seal compact gaps and penetrations in ductwork. Choosing a compound with the mandatory adaptability and heat resistance is very important for making certain efficient and sturdy seals. PVC duct pipe is on the market https://puductingsurabaya58146.wikibyby.com/1528497/the_fact_about_first_duct_panel_polyurethane_surabaya_that_no_one_is_suggesting