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Started By
Message
Any HVAC folks can help identify my system?
Posted on 2/6/24 at 9:09 am
Posted on 2/6/24 at 9:09 am
Can you tell the size, SEER or anything from this label? Where would I look for that info if not here? Just moved in and no documentation as to who installed or size so I'm trying to figure it out. Its a RUUD labelled unit.
BONUS - whats that little doodad in the second pic?
BONUS - whats that little doodad in the second pic?
4
Posted on 2/6/24 at 9:22 am to JusTrollin
i dont know how you got all that from the image but thank you!
Posted on 2/6/24 at 9:26 am to CAD703X
Follow up question:
my return is 24x36 which is apparently a fairly obnoxious size for finding cheap filters and even replacing the return grate was an adventure in finding one that size that didn't cost an arm and a leg. Neither home depot nor lowe's carried one that size even online.
is that normal? this is an older house so maybe that larger size used to be more common?
what would justify such a large return in a house? its almost like this is a commercial size.
my return is 24x36 which is apparently a fairly obnoxious size for finding cheap filters and even replacing the return grate was an adventure in finding one that size that didn't cost an arm and a leg. Neither home depot nor lowe's carried one that size even online.
is that normal? this is an older house so maybe that larger size used to be more common?
what would justify such a large return in a house? its almost like this is a commercial size.
This post was edited on 2/6/24 at 9:28 am
Posted on 2/6/24 at 9:27 am to CAD703X
Scan the QR code with your phone 
This post was edited on 2/6/24 at 9:28 am
Posted on 2/6/24 at 9:27 am to TheBoo
i tried, it said 'no results'.
Posted on 2/6/24 at 9:28 am to CAD703X
Ah, the one on the main label took me Rheem's website showing the product information.
Posted on 2/6/24 at 9:32 am to TheBoo
ok my phone sucks. :( what did you use to get the QR code? i was using th default google lens. maybe i should download a different app.
Posted on 2/6/24 at 9:34 am to CAD703X
I can't think of a scenario where having too large (area) of a supply is a bad thing. (Length of return is different)
- Helps keep static pressure across filter low
- Larger filters last longer between changes
General rule of thumb is 144 sq in of return per ton so you are covered.
Edit: RP(16 SEER) (48,000) btu 12,000 btu per ton
Can remember what the other letters after that mean but the 2 is a 2 stage
- Helps keep static pressure across filter low
- Larger filters last longer between changes
General rule of thumb is 144 sq in of return per ton so you are covered.
Edit: RP(16 SEER) (48,000) btu 12,000 btu per ton
Can remember what the other letters after that mean but the 2 is a 2 stage
This post was edited on 2/6/24 at 9:37 am
Posted on 2/6/24 at 9:34 am to CAD703X
16 SEER
The black doodad is a filter. The doodad with the caps is a Schrader valve.
The black doodad is a filter. The doodad with the caps is a Schrader valve.
Posted on 2/6/24 at 9:40 am to mdomingue
thanks. i just also noticed there is a model # at the top i could have just googled and avoided this thread. 
CAD is still waking up today.
CAD is still waking up today.
Posted on 2/6/24 at 9:43 am to CAD703X
You just said outloud what we were all thinking
Posted on 2/6/24 at 9:53 am to CAD703X
quote:
thanks. i just also noticed there is a model # at the top i could have just googled and avoided this thread.
CAD is still waking up today.
Happens to the best and the brightest. And you and me as well
Posted on 2/6/24 at 10:09 am to CAD703X
You have the answer on size (tonnage).
Return grill. The guideline is 400 CFM air per ton, so 1600 CFM return air required for a 4-ton unit. Filter Grill - capable of providing 2 CFM air per sq inch with filter installed, so 36 x 24 x 2 = 1728 CFM - thus your return grill is sized properly to provide your system with the return air it needs. That assumes the return air duct that goes to the air handler/furnace is also 24 x 36 in dimension. But if a round return air duct is attached to the return air grill and enters the return air plenum from the filter grill it should be about 19-20 inches in dia, if metal duct, to supply the 1600 cfm, maybe about 22-24 in dia if flex duct.
Good hardware stores will often carry “odd” size filters not carried by the big box stores.
Return grill. The guideline is 400 CFM air per ton, so 1600 CFM return air required for a 4-ton unit. Filter Grill - capable of providing 2 CFM air per sq inch with filter installed, so 36 x 24 x 2 = 1728 CFM - thus your return grill is sized properly to provide your system with the return air it needs. That assumes the return air duct that goes to the air handler/furnace is also 24 x 36 in dimension. But if a round return air duct is attached to the return air grill and enters the return air plenum from the filter grill it should be about 19-20 inches in dia, if metal duct, to supply the 1600 cfm, maybe about 22-24 in dia if flex duct.
Good hardware stores will often carry “odd” size filters not carried by the big box stores.
This post was edited on 2/6/24 at 8:46 pm
Posted on 2/6/24 at 1:28 pm to CrawDude
quote:
Return grill. The guideline is 400 CFM air per ton, so 1600 CFM return air required for a 4-ton unit. Filter Grill - capable of providing 2 CFM air per sq inch with filter installed, so 36 x 24 x 2 = 1728 CFM - thus your return grill is sized properly to provide your system with the return air it needs. That assumes the return air duct that goes to the air handler/furnace is also 24 x 36 in dimension. But if a round return air duct is attached to the return air grill and enters the return air plenum from the filter grill it should be about 19-20 inches in dia, if metal duct, to supply the 1600 cfm, maybe about 22-24 in dia if flex duct.
clearly i know less than nothing about HVAC systems
Posted on 2/6/24 at 2:48 pm to CAD703X
quote:
i dont know how you got all that from the image but thank you!
the 16 in the model number is the seer
the 48 in the model number is the size 12 per ton so 48 is 4 ton
Posted on 2/7/24 at 8:20 am to CAD703X
quote:
ok my phone sucks. :( what did you use to get the QR code? i was using th default google lens. maybe i should download a different app
My camera. Iphone.
Posted on 2/9/24 at 2:37 am to mdomingue
The doodad with the caps is a Schrader valve."
It's actually a high side service port . The service port has a schrader in it.
It's actually a high side service port . The service port has a schrader in it.
Posted on 2/11/24 at 8:33 am to CAD703X
quote:
24x36
Go on Amazon and buy them, filterbuy, filter king, or airx have been the same quality as filtrete.
I paid $15/filter for a 6 pack of Merv 11.
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