| 3.1601.6a
Preparation | Surrounding insulation will be cleared to expose the joints being sealed Duct surface that accepts sealant will be cleaned | Gain access Achieve proper adhesion for airtight seal |
| 3.1601.6b
Metal to metal | Ducts will be fastened with a minimum of three equally spaced screws or acceptable mechanical connections | Ensure joints are durable |
| 3.1601.6c
Flex to metal | Joints will be fastened with tie bands using a
tie band
Tie band
A strap, often made of nylon, that mechanically squeezes a flexible duct to a fitting. Must have a minimum performance temperature rating of 165° (per UL 181A-type test) and a minimum tensile strength rating of 50 pounds
tensioning tool or mechanical band, and sealed with approved mastic and UL181B tape | Ensure joints are durable Reduce air leakage |
| 3.1601.6d
Duct board to duct board | Joints will be fastened with a clinch stapler, rated tape, and mastic | Ensure joints are durable Reduce air leakage |
| 3.1601.6e
Duct board to flexible duct | An appropriate take-off collar in accordance with
NAIMA
NAIMA
North American Insulation Manufacturers Association, www.naima.org
standards will be used and sealed with approved mastic | Ensure joints are durable Reduce air leakage |
| 3.1601.6f
Metal plenum to air handler cabinet | Plenum will be fastened with a minimum of three equally spaced screws on each side Canvas connection between plenum and unit will be installed so that it does not reduce the inside dimensions of the duct | Ensure joints are durable Reduce air leakage Optimize airflow |
| 3.1601.6g
Duct board plenum to air handler cabinet | Termination bar or metal strip will be fastened with screws Duct board will be installed between the screw and the termination bar | Ensure joints are durable Reduce air leakage |
| 3.1601.6h
Terminal boot to wood | Screws or nails will be used to fasten boot to wood Seams and boot to subfloor will be sealed with mastic | Ensure joints are durable Reduce air leakage |
| 3.1601.6i
Terminal boot to gypsum | Boot hanger will be fastened to adjacent framing with screws or nails Boot will be connected to boot hanger with screws Integral snap boots will be installed Seams of boot will be sealed with mastic Boot to gypsum will be sealed with caulk in accordance with local code and standards | Ensure joints are durable Reduce air leakage |
| 3.1601.6j
Duct board to flex | An appropriate take-off collar in accordance with
NAIMA
NAIMA
North American Insulation Manufacturers Association, www.naima.org
standards will be used | Ensure joints are durable Reduce air leakage |
| 3.1601.6k
Replacement of insulation | Insulation will be returned or replaced with equivalent R-value | Maintain insulation value |
