M-D Low 36" L x 3-1/2" W x1-1/8" H Oak Threshold BRAND_STEELCOAT® PETOSKEY PLASTICS Millions of them are now

Millions of them are now installed on homes and business structures to protect against wind conditions that can cause waste gases to spill back into the structure through the appliance draft hood

Flat regular-cut blade

and a cartridge filter

Used to connect cylinder valve to changeover regulators or to tee check fittings

Scored 800 gm (gram) on the MaP (Maximum Performance) test

M-D Low 36" L x 3-1/2" W x1-1/8" H Oak Threshold BRAND_STEELCOAT® PETOSKEY PLASTICS Millions of them are now36' clear grade oak with replaceable vinyl insert. Ideal for home use. Seals out drafts and dust. Unfinished, paint to match rest of doorway. Packed with screws.