Zehnder MVHR.90 Filter Set, ISO Coarse (G3), 2 pcs

Zehnder Filter Sleeves For MVHR 90 & 91
Consisting of 2 X Filters each 38cms x 19cms

Ideally, filters should be inspected monthly and given a light vacuum to remove dirt and debris.

Filters will eventually become blocked with residual debris and should then be replaced. Generally, blocking will occur every 6 - 12 months depending on the location (near busy roads or inner city areas tend block more quickly than remote country settings).