3 ms·
Those can be harder to source I've found. Cheaper to use two filters than one as well since you can replaced the prefilter more often.
by post_break 6y ago
Those can be harder to source I've found. Cheaper to use two filters than one as well since you can replaced the prefilter more often.
- bluGill 6y agoI used a 25x20x4 which was easy to find. Even though I didn't do anything to stop air from flowing around the backside of the filter to the fan it still gets noticeably black fast.
- rootusrootus 6y agoBut more difficult, yes? Stacking filters is very different from getting a thicker filter. The former increases air resistance, the latter decreases it. So to get the equivalent behavior from two 20x20 filters, you'd have to device some way of routing air through both of them in parallel.