Reznor Garage Heater filters?

[ryolse]

Reznor Garage Unit Heater filters?

I have a Reznor UDAP30 and was curious if anyone has ever added a filter on the RA side? I've been searching around and see filter kits for their centrifugal units but nothing for their blade units.

Thanks for the info

 

[sands35]

A little sheet metal or wood for a box and a furnace filter. Why not? But then, you could just blow or vacuum it out once a year.

I'd only worry about it if I had a wood shop, and then probably only for the combustion air, not the circulating air. But then you can pull combustion air from the outside anyway so why bother?

 

[ryolse]

It varies how much wood or other combustible use the garage sees. I've just noticed that when I do more of that type of work, or the obvious start of season, that it has that smell of burning and it would just be nice to lower the amount of potential clogging/grim on the unit.

I was thinking of welding up a bracket on the back with 2 higher flowing filters in V mounted formation similar to how they have it for other units shown here.

 

[sands35]

Your reznor can pull combustion air in from the outside. You are doing that?

It will certainly reduce the amount of combustibles that get sucked into the recirculating part of the units. It can't hurt. The fan is an axial or radial fan? Axial fans (think ceiling fan or paddle fan) don't do well with pressure development, so use the cheep spun filters, not the corrugated paper filters. The fan will stall.

If you have the radial (AKA squirrel cage or the ones with the scroll shape), then you can probably use a HEPA type corrugated paper filter.

Bigger is better as far as filters go. The unit has some sort of over temp sensor? It's just you are changing how the unit is supposed to work. So pay attention to the unit until you have confidence that you won't do something to make it get too hot.

Before you commit to welding up something, you could use cardboard and duct tape to make sure it will work.

 

[ryolse]

Re: Reznor Garage Unit Heater filters?

Thanks for the input. The unit was installed by the previous home owner, and it's nice to regain the heat instead of pulling cold outside air in so I haven't ducted it to the outside.

As I was saying above it's an axial fan, so I was wanting to use a low pressure dropping filter and try to maximize the surface area to try keeping it's efficiency up.

Most of my welding projects like this start out with cardboard so I'll be continuing that to test and verify that it's operational before spending money or time on metal.

Here's the space I'm working with behind the unit.

 

[sands35]

Plenty of space.

Combustion air is the one that really needs to be wood dust free. The exchange air just gets a little smelly if there is wood dust on the heat exchanger. A smaller filter on that would be a good idea if you want to pull from the inside.

 

[ryolse]

Re: Reznor Garage Unit Heater filters?

Agreed, I was also thinking of possibly enabling only the G terminal and using it as an air filter. Who knows maybe even replacing the axel fan with their centrifugal unit, down the road if the filters cause any resistance and a higher amp draw.

Although I can't seem to find much information on the Direct Drive Motor Assembly which looks to be part# 202731, such as size, additional weight, additional mounting requirements due to weight and any additional wiring/voltage/amp requirements. It seems rather large based on the 1 picture I can find and I'm not sure what it looks like on the other side next to the combustion vents, I'm guessing it only has the 1 inlet which is on the opposite side and shown in the picture. The pricing seems to range from $400-$600 before shipping.

 

[ryolse]

Re: Reznor Garage Unit Heater filters?

After about 30 minutes of over thinking it I ended up just taking the five 14x14 3M 1500 filters that I bought and taped them together. I also got a new to me thermostat that has Heating and a Fan only mode so I could filter out any stank air when not in heating mode.

The Air flow seems fine, later I'll use a Magnehelic on it, but I've never been a big fan, no pun intended, of the axel fan that the UDAP30 comes with. There's the above centrifugal fan which comes on the UDB series and is available as a kit for the UDA series, but it's not worth $600 in my opinion. I might look into a higher CFM centrifugal fan for cheaper.

 

[finn]

The Beacon Morris manual specifically warns against any ducting or other modifications that could affect airflow.

Your modifications violate that warning and your unit is similar in design.

You need to upgrade to a regular furnace to safely do what you are proposing.

 

[sands35]

I'll bet if you pulled the motor specs from an existing fan you could get close to the fan specs by looking at McMaster or Grainger for similar fans. Check out use appliance places like Habitat for Humanity ReStores for used blowers.

Yes, make sure you pay attention to the unit to make sure it won't over temp.