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Furnace filters #4529587
09/29/17 05:04 PM
09/29/17 05:04 PM
Joined: Sep 2002
Posts: 2,593
VA
Gebo Offline OP
Gebo  Offline OP

Joined: Sep 2002
Posts: 2,593
VA
Iíve read so much about which furnace filter to use...Yada yada...

MERV over 11 too restrictive. Repair guys use those flimsy filter things at $1 each. Electrostatic is the way to go. Get a lifetime filter and never replace again.

Does anybody definitively know? Experts please reply. grin


'98 LEX LS400 290K
'02 4Runner 230K
'05 Lex LS430 85K
'07 Lex GX470 65K
Amsoil in last two.
Schaeffer in the first two.

Re: Furnace filters [Re: Gebo] #4529598
09/29/17 05:14 PM
09/29/17 05:14 PM
Joined: Feb 2009
Posts: 1,758
wv
krismoriah72 Offline
krismoriah72  Offline

Joined: Feb 2009
Posts: 1,758
wv
Im not an expert by any means but i think it depends on how easy the filter is to change and how much stuff you are filtering.

I change my mothers every 3 months or so and its absolutely filthy. If i use the high dollar filters they clog and suck themselves inward bypassing, the cheapos seem to do the best trapping everything on one side and not imploding.

So my vote would be to try the cheapo blue glass media filter and check on it every month..if its not that bad then move up to a better one and check on it every few months.

Re: Furnace filters [Re: Gebo] #4529599
09/29/17 05:18 PM
09/29/17 05:18 PM
Joined: Nov 2004
Posts: 1,919
SD
zrxkawboy Offline
zrxkawboy  Offline

Joined: Nov 2004
Posts: 1,919
SD
I use the least expensive pleated filter, on the recommendation of the HVAC tech at work. Works for me.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Furnace filters [Re: Gebo] #4529602
09/29/17 05:20 PM
09/29/17 05:20 PM
Joined: Sep 2012
Posts: 5,524
DFW
DBMaster Offline
DBMaster  Offline

Joined: Sep 2012
Posts: 5,524
DFW
I compromise with MERV 7 or 8 pleated filters. They catch more than the fiberglass cheapies and have more surface area. Mine are both in ceiling grills and I run my blower continuously and just change them when they look dirty which ends up being about every two months or so. I get them cheap because I work for Lennox and our filters are made specifically for us. If my unit in the attic had the space I would add a housing for a 5" filter, throw a MERV 10 or 11 in there, and just change it annually. I did add self adhesive door weatherstripping inside my grills so the filters are held in place and bypass is more or less eliminated.

There really isn't ONE right filter setup for every situation I'm afraid.

Re: Furnace filters [Re: Gebo] #4529618
09/29/17 05:32 PM
09/29/17 05:32 PM
Joined: Sep 2002
Posts: 2,593
VA
Gebo Offline OP
Gebo  Offline OP

Joined: Sep 2002
Posts: 2,593
VA
DBMaster, believe it or not, Iím still using a Pulse. Installed in 1994. Never changed plug. Only cleaned and replaced that filter. Which one of your filters should I use?


'98 LEX LS400 290K
'02 4Runner 230K
'05 Lex LS430 85K
'07 Lex GX470 65K
Amsoil in last two.
Schaeffer in the first two.

Re: Furnace filters [Re: DBMaster] #4529621
09/29/17 05:37 PM
09/29/17 05:37 PM
Joined: Mar 2014
Posts: 3,820
NJ
Leo99 Offline
Leo99  Offline

Joined: Mar 2014
Posts: 3,820
NJ
Originally Posted By: DBMaster

There really isn't ONE right filter setup for every situation I'm afraid.


Probably why they make various grades.

Like oil...


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 370,000 miles
2015 Camry 70,000 miles
Re: Furnace filters [Re: Gebo] #4529627
09/29/17 05:42 PM
09/29/17 05:42 PM
Joined: Sep 2012
Posts: 5,524
DFW
DBMaster Offline
DBMaster  Offline

Joined: Sep 2012
Posts: 5,524
DFW
As I said, there isn't ONE correct filter. Regardless of the furnace type, the rest of the system can be very different from one installation to another (I'm talking about different plenums, return air setups, geography and weather conditions affecting what kind and how much dust you have, etc.). but, with that said, what size and how many filters does your house use?

MAYBE if I actually saw your system I could make a recommendation, but I'm no expert. I'm a supply planner and I manage inventories of various commodities. I'm not a tech, though, I have done some work on my own system and I've picked up a fair amount of knowledge over the years.

If your filter is turning into a dish there's too much restriction, period. My house was built with only ONE return air grill. When the system ran it sounded like a vacuum cleaner and the filter immediately looked like an inverted bowl. I built a return air plenum and added a second filter grill and return duct - much better.

Oh, and yes, those Pulse furnaces were very efficient for their time and durable as nails. One of the items out of the thousands I buy was the spark plugs, from Federal Mogul. Lennox discontinued them six years ago after FM decided to cut off our credit due to a single late payment of $1,200.

Re: Furnace filters [Re: Gebo] #4529641
09/29/17 05:56 PM
09/29/17 05:56 PM
Joined: Sep 2002
Posts: 2,593
VA
Gebo Offline OP
Gebo  Offline OP

Joined: Sep 2002
Posts: 2,593
VA
I have 3 return ducts upstairs and 2 return ducts downstairs. I currently have the downstairs ducts sealed off. If I open them, they pull "all" the air. I was wondering if there was someway to utilize them better? In the summer, I have to close off the finished basement blower ducts because it gets too cold. I open them up in the winter to keep it a little warmer. I'll send you some pics PM style. If you have time to comment, ok. If you don't, no big.


I'm using a Lennox Electronic Filter EAC-12 and the only other filter I use is a 1 inch 20x25 right beside the motor. Yep, it does sometimes dish....not good....

I was thinking about getting a 1 inch BOAIR 20x25.


'98 LEX LS400 290K
'02 4Runner 230K
'05 Lex LS430 85K
'07 Lex GX470 65K
Amsoil in last two.
Schaeffer in the first two.

Re: Furnace filters [Re: Gebo] #4529668
09/29/17 06:25 PM
09/29/17 06:25 PM
Joined: Mar 2013
Posts: 5,306
The Midwest
skyactiv Offline
skyactiv  Offline

Joined: Mar 2013
Posts: 5,306
The Midwest
My brother is a HVAC guy by profession. He put in a Goodman 90+ furance and an evaporating coil at cost for $1200 about 15 years ago. The air filter box takes a 16X20X5 filter.
A 5" thick air filter. I started out using the cheap 1" filters which the next owner of the house can is so desired. I switched to using MERV 13 filters and the dust is much less vs the cheap filters. Guess what? The blower motor went out.
It is a two stage motor and it cost me $600 for the motor! I'm not sure if the MERV 13 filter caused that or not.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

Re: Furnace filters [Re: Gebo] #4529682
09/29/17 06:37 PM
09/29/17 06:37 PM
Joined: Oct 2008
Posts: 1,379
MD
ET16 Offline
ET16  Offline

Joined: Oct 2008
Posts: 1,379
MD
I use the washable filters that you get a Home Depot.

Re: Furnace filters [Re: Gebo] #4529686
09/29/17 06:41 PM
09/29/17 06:41 PM
Joined: Feb 2010
Posts: 4,838
Central Texas
sleddriver Offline
sleddriver  Offline

Joined: Feb 2010
Posts: 4,838
Central Texas
I just read a review of this on CR. 4" deep filters performed the best. Unfortunately, I'm not set up for one.

Of the 1" thick types, Filtrete Healthy Living Ultimate Allergen Reduction 1900 MPR air filter scored excellent with minimal resistance. It's about $20 though.

You'll only get the best performance from such a filter if both supply & return air ducts are sealed.


1998 Volvo V70 T5 228,880 mi. Original Owner.
M1 10W-30 HM
"It's never a mistake to buy tools, defined broadly. They're not a cost, they're an investment." - J.B. Peterson
Re: Furnace filters [Re: Gebo] #4529739
09/29/17 07:33 PM
09/29/17 07:33 PM
Joined: Jul 2009
Posts: 866
texas
danez_yoda Offline
danez_yoda  Offline

Joined: Jul 2009
Posts: 866
texas
Find a combo deal on amazon or ebay for 10 or so merv 5,6,7. Pleated Filters and you are golden.

Re: Furnace filters [Re: Gebo] #4529758
09/29/17 07:44 PM
09/29/17 07:44 PM
Joined: May 2016
Posts: 725
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline

Joined: May 2016
Posts: 725
Canada


I like electrostatic, but the collection plates are a hassle to clean and contacts can
break or bend.

I have a pleated filter first, then the electrostatic! Best combo ever, installer
of the new furnace didn't want to do the duct work for it, but I paid extra to get it!

Then I got the cold air return grills that have filter too as a DIY install, nice!

I'll never "need" duct cleaners again LOL

Re: Furnace filters [Re: Gebo] #4529803
09/29/17 08:32 PM
09/29/17 08:32 PM
Joined: Jan 2017
Posts: 647
Melbourne, Florida
RichardS Offline
RichardS  Offline

Joined: Jan 2017
Posts: 647
Melbourne, Florida
Just from my own personal reading when HEPA shopping, it seemed most common suggestion to avoid HVAC filters above MERV 8. It was the best middle ground for air filtering without excessive restriction causing cooling issues.

I run filtrete simply because I like lowes better than Home Depot, and try to get the MPR (600/800) closest 6/8 MERV, but it goes as high as 2800 MPR.

It's important to keep in mind that MPR is a rating only for small particles, and doesn't take small/large like MERV does. There's no real MPR = MERV chart I could find.

Run a MERV 6-8, and then a HEPA for the tiny stuff.


2011 Prius II

2012 GLK350
Re: Furnace filters [Re: Gebo] #4529806
09/29/17 08:36 PM
09/29/17 08:36 PM
Joined: Jan 2006
Posts: 5
Virginia
dschultz Offline
dschultz  Offline

Joined: Jan 2006
Posts: 5
Virginia
Almost all the pleated 1 inch filters have the problem of quickly restricting airflow. The higher the rating (MERV, etc.) the faster the filter will load up.
The washable filters can also be too restrictive. Although systems with ECM motors can compensate for restriction there is a limit and long term restrictions can cause coil icing when cooling, heat exchanger cracks on gas furnaces, and high pressure problems on heat pumps.

If you want to have high efficiency media filters I recommend you go as thick as possible and then select a high MERV rating.

I had a Carrier electronic air cleaner that finally failed, it was never as good as promised, I removed the cells and measured the space for a media filter.

I found a company the makes custom filters send me an 18 x 24 x 6 MERV 11 filter, $24 each minimum order of 4.

They last me about a year, fan running almost continuously, and no dust accumulating on blower.

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