How can I increase the air flow from my furnace?

Question

I have a dayton blower motor 6K778. It is 1/3 hsp and provides1725 rpm.

Answer 1

You could get a Miltie speed replacement from A.O.Smith.

Answer 2

You can only push so much air with that blower unit. The motor size and speed have been designed specifically for the unit and it's designed application. The only things that will help, is to insure that your filter is cleaned, and that the duct work is sized properly. Air is just like water, you can only get so much through the duct system, when you have reached the max flow, it does not matter how large the blower or how many speeds or how much pressure you give it. I have seen people try putting larger blowers in, it sounded like a jet engine running through the house and did not solve his problem. Remember, with air systems, even really hot air moving fast feels cold on the human body, makes it feel drafty in the house. A slower moving air also transfers more heat from the heat exchanger increasing your eff. of the unit

Answer 3

That's just a single speed motor, you kind of got what ya got as far as the motor goes. If you use one of those one inch wide electrostatic filters, chuck it in the trash and get a good pleated one of the same size. The electrostatic ones are too restrictive.
You'll need an HVAC guy to size your duct and tell you if you are undersized. Honestly, we have put some of those duct booster fans in a few times in the past and for the money they do nothing. I've even went so far as to measure the airflow with a small air balance hood and found little or no difference with or without the booster fan running.

Answer 4

your kind of restricted in increasing your air flow...the motor will do what the motor will do which is 1725 revolutions per minute...

What you can do is input duct boosters into the system and they will increase the overall airflow into the zone that you desire.

I would also check to see if you have flow restricters near the plenum (the furnace area). They will look like a steel bar sticking out of the side of a duct and have a locking nut to hold them in place once adjusted.

Also, check to see that your make-up air (the box where air goes to your blower) is not restricted. If air cannot get in, air cannot get out...

Hope this helps...contact me via email if you need any other help

Answer 5

If your fan is a belt drive unit, increase the size of the pulley on the motor.
If direct drive you might find a higher RPM motor. I don't have a WW Grainger book handy so I can't tell you which one to purchase.
Also check the wiring schematic to see if the fan is set on High speed.

Answer 6

you have a belt drive motor you need to get a adjustable pulley for the motor and adjust it to a bigger size. but take a good look at the pulley you have now chances are it is already an adjustable type you need a set of island wrenches a vise grip and a pump pliers also called channel locks adjust the pulley to a bigger size good luck.

Answer 7

Dayton 6k778