which was developed by ASHRAE (formerly the American Society of Heating, Refrigerating and Air-Conditioning Engineers). But 3M and Home Depot have developed their own classification systems called ...

Your furnace room is likely supplied with a “makeup air” duct. It’s a large, flexible, insulated duct that probably drops into a bucket. This duct supplies your house with fresh air to ...

Modine Manufacturing has signed a deal to buy AbsolutAire, which makes direct-fired heating, ventilation and make-up air systems, for an undisclosed amount. Modine Chief Executive Neil Brinker said ...