Zehnder ComfoAir 200 Filter Set, ISO Coarse (G4), 2 pcs metal Greenwood Acoustic MA3051 wall ventilator

Greenwood Acoustic MA3051 wall ventilator in white providing acoustic attenuation to Dn

Class II equipment

This is the 'T' Timer model - a single speed fan operated via a light switch or pull cord

F7 fine filters

This type of installation requires a more powerful motor as the extracted air will generally have to travel further than a standard through wall installation

Zehnder ComfoAir 200 Filter Set, ISO Coarse (G4), 2 pcs metal Greenwood Acoustic MA3051 wall ventilatorIdeally, 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). Zehnder P N 400 100 014