🔥 ANSI Z83.4 / CSA 3.7 (100% Thermal Efficiency, 10,000-60,000 CFM, Delta-T 40°F-100°F)

Direct Fired Make-Up Air (MUA) Calculator

Size 100% thermal efficiency direct-fired gas make-up air units (MUA / Greenheck / Cambridge / CaptiveAire) under ANSI Z83.4 & CSA 3.7: calculate natural gas burner firing rate (BTU/hr) based on ventilation airflow (CFM) and winter temperature rise (Delta-T 40 deg F to 100 deg F), eliminate building negative pressure drafts, and HVAC contracting profits.

1. Project & Operating Inputs

Make-Up Air Flow Rate (CFM e.g. 25,000 CFM Building Replacement Air)

Heating Temperature Rise (Delta-T deg F e.g. 65.0 deg F Winter Rise)

Customer Bid Price for Supplied & Roof-Mounted Direct-Fired MUA ($)

Greenheck Direct Fired MUA, Maxon Burner, VFD Fan, Curb & Riggers ($)

2. Financial Breakdown & Yield

ANSI Z83.4 DIRECT FIRED MUA

Turnkey Direct-Fired MUA Package Profit

Industrial HVAC Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Direct Cost