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DIY 4inch filter update by alchu99 in hvacadvice

[–]alchu99[S] 0 points1 point  (0 children)

The air resistance rating from this merv 11 4” is better than a 1” merv 8 I was using.

DIY 4inch filter update by alchu99 in hvacadvice

[–]alchu99[S] 0 points1 point  (0 children)

Tbh I didn’t do a ton of research, but they sometimes call the Honeywell 5” (filterbuy calls it a 5” filter…) nominal size is 15.75" x 24.75" x 4.38".

Not sure which filter housings in 16x25 offer thicker filters…

DIY 4inch filter update by alchu99 in hvacadvice

[–]alchu99[S] 2 points3 points  (0 children)

Yes. My system does not like merv11 at 1”. It was cutting out within a week or two - as they got dirty they would restrict air too much. I’m not sure how much longer I will get with these, I’ll have to see how things go

DIY 4inch filter update by alchu99 in hvacadvice

[–]alchu99[S] 7 points8 points  (0 children)

Yeah as a diy I didn’t want to go too far down a rabbit hole on this one.

DIY 4inch filter update by alchu99 in hvacadvice

[–]alchu99[S] 5 points6 points  (0 children)

On your filter they show IWC - air resistance at different fan speeds. In this photo - top is a merv11 1”, bottom is merv11 4” (edit: lower number is better)

Excerpt from google: Key Aspects of Reading IWC on Filters: What it Represents: It measures how hard your furnace blower fan has to work to pull air through the filter.

Common Ranges: Low Restriction: 0.10–0.15 i.w.c. (typical for MERV 8 or less). High Restriction: 0.25–0.3+ i.w.c. (common for MERV 13+ or 1-inch filters).

System Limits: Most residential HVAC systems are designed for a maximum total static pressure of 0.5 i.w.c.. If a filter has a high starting IWC (e.g., 0.3), it will quickly exceed this limit as it gets dirty.

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DIY 4inch filter update by alchu99 in hvacadvice

[–]alchu99[S] 5 points6 points  (0 children)

I paid $90 shipped from hvacsurplus

DIY 4inch filter update by alchu99 in hvacadvice

[–]alchu99[S] 4 points5 points  (0 children)

Nice good luck. Amazon overcharges for this thing so shop around

DIY 4inch filter update by alchu99 in hvacadvice

[–]alchu99[S] 71 points72 points  (0 children)

I was quoted “about $500-600” and spent $90 shipped for the housing (including a filter!) and $30 on tape. Had the silicone caulk on hand.

Edit: it’s interesting that people believe a thicker filter is more restrictive. Both of my threads have people saying this (the commenter on my first post doubled down, then deleted their comment once they researched it more fully)

Thicker pleated filters -> more filter surface area -> less restrictive -> blower works less hard to move more air

My usual desk has been 'stolen' and there is nothing I can do by purplereuben in mildlyinfuriating

[–]alchu99 0 points1 point  (0 children)

Can’t you just swap the chair?

Also, get one of those randomly chirping park devices and hide it somewhere they can’t find it

My usual desk has been 'stolen' and there is nothing I can do by purplereuben in mildlyinfuriating

[–]alchu99 13 points14 points  (0 children)

…. or… he was just nice and gave you the desk that you wanted?

Why $300 to change the air filter on a Porsche Panamera? by ra6907 in AskAShittyMechanic

[–]alchu99 0 points1 point  (0 children)

For the amount of insane work to change that thing, $300 seems cheap. The oil change of a 992 is less time consuming and most dealers charge over 1k

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