Our QAD Series direct gas fired make up air units are available in standard sizes from 100,000 to 280,000 CFM  Standard units are manufactured with heavy gauge G90 galvanized steel, insulated where needed, with 2" 3lb. non-wicking insulation, lined with 20 gauge galvanneal to eliminate air borne fibers entering the air stream. 

Fans are AMCA rated, either forward curved or backward inclined.  Burners are proven brand name with stainless mixing plates capable of 25:1 turndown.  Valve trains and controls are built to either CSA, IRI, FM or FM with vent. 

Direct gas fired units are the most efficient product to replace exhausted air and overcome negative pressure, reducing cold drafts, employee discomfort and absenteeism.