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Knob-operated worm gear adjusts butterfly valve, to full open or close. Controls volume evenly, not air pattern minimum air restriction. Steel ring has brown enamel finish. Includes adjustable handle.

4 In. R2 Pro wall exhaust hood white, Innovative damper design prevents back drafts and heat loss. Designed for maximum airflow. Energy efficient. Weighted damper prevents back-draft. 100% gasket seal provides quiet efficient operation. Ideal for dryer...

Concrobium Moisture Grabbers XL provide humidity reduction technology for large, indoor areas. The unique water-absorbing pouches absorb and eliminate excess moisture in areas that are prone to excess humidity. The easy-to-use pouch traps moisture on the...

Cast-iron. Converts 30 gallon or 55 gallon drum into woodburning heater. Includes cool touch cam-lock type door, spin dial draft control, mounting legs, stovepipe collar and hardware. Barrel and gasket material not included.

4 In. dryer wall vent cap. Modern, flush mount design with magnetic seal that allows for maxiumum air flow and easy clean access. Constructed with powder coated galvanized steel.

Sludge Treat storage tank additive cleans and conditions heating system fuel oil. Prevents fuel-related failures, improves combustion efficiency, reduces soot formation and conserves energy. Hercules products are built to last and are trusted by plumbers...

The Lambro 3-1/4 In. x 10 In. plastic exhaust vent is ideal for venting through the wall. This vent is used for bath fan exhaust, range hood exhaust, microwave exhaust and other general venting applications that require moist air and humidity from...

Stamped steel construction with turnback frame. 2 grille bars to an inch 40 deg. down defection. Size in description is opening size. White.

Furnace humidifier filter. Improve humidification with a new replacement pad. Materials and workmanship equal manufacturer specifications. Fits Aprilaire 110, 250, 500, 500A, 558, CHIPPEWA 220. Fits Honeywell HE220A, 220B, 225A, 225B. Fits BestAir...

Caps keep vent pipes dry. Prevents internal water damage, resists backdrafts, and promotes positive air flow. Made from galvanized steel.

External screen prevents entry of most bird species. Aluminum top and galvanized flashing. Slips inside of pipe and locks into place with spring clips. Must not be used for woodburning applications. Size refers to the inside diameter of the pipe or...

Elevated structure with wide grates to allow for even air flow. Contoured design and ends hold logs securely in place.