This all-in-one HVAC sheet metal box serves as a replacement for more than 100 metal ductwork parts and adaptors. It can replace 42 sheet metal boxes, allows air to enter on all five sides, and accepts 4- through 8-inch ducts.
from Odor Management Plan in Controlling Smoke Odor https://ift.tt/2H4WBxN
via https://ift.tt/2E0zRLH
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