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