Are you a homeowner or building manager?
Find a Contractor »

Hey Ed, What Is the Correct AF on a Fuel-Fired Furnace?

In this edition of "Hey Ed," Ed talks about the correct air flow for a fuel-fired furnace

Hey Ed, what is the correct AF on a fire fueled furnace? The correct AF on a furnace. And hey, I know what you’re thinking. Air flow, I think everybody knows that’s what that stands for. Air flow on a fuel-fired furnace. Every manufacturer that puts out a furnace, whether it’s an oil furnace or a gas propane natural, furnace on the data plate. And I’m dating myself when I say data plate. They’re not plates. They’re probably in plates for 25 years. They’re stickers. But on that sticker, it will tell you a range, making up numbers. I’m going to say 25 to 50 is what’s published inside of a furnace. We’re going to take the 25 and the 50. We’re going to add them together. We’re going to divide by two. And our target temperature rise on that furnace, based off of the guidance that you’ll find in manuals, is the middle of that temperature rise. And that’s the way I see it.

Ed Janowiak is the Manager of HVAC Design Education at ACCA.

Have a question you'd like to see Ed answer?

Send it on over by using the form below.

Posted In: Hey Ed

Looking for an ACCA QA Accredited Contractor?

Are you a homeowner or building manager?


join now

PLUS It's Risk Free!