Resistant to moisture and microbial growth

Extremely low pressure drop and high dust-holding capacity

Pleats hold together even when wet, preventing delaminating, excessive buckling, collapsing, racking, warping and bending

Low initial resistance contributes to energy saving

Resistant to moisture and microbial growth

Extremely low pressure drop and high dust-holding capacity

Pleats hold together even when wet, preventing delaminating, excessive buckling, collapsing, racking, warping and bending

Low initial resistance contributes to energy saving

Resistant to moisture and microbial growth

Extremely low pressure drop and high dust-holding capacity

Pleats hold together even when wet, preventing delaminating, excessive buckling, collapsing, racking, warping and bending

Low initial resistance contributes to energy saving

Resistant to moisture and microbial growth

Extremely low pressure drop and high dust-holding capacity

Pleats hold together even when wet, preventing delaminating, excessive buckling, collapsing, racking, warping and bending

Low initial resistance contributes to energy saving

Resistant to moisture and microbial growth

Extremely low pressure drop and high dust-holding capacity

Pleats hold together even when wet, preventing delaminating, excessive buckling, collapsing, racking, warping and bending

Low initial resistance contributes to energy saving

Resistant to moisture and microbial growth

Extremely low pressure drop and high dust-holding capacity

Pleats hold together even when wet, preventing delaminating, excessive buckling, collapsing, racking, warping and bending

Low initial resistance contributes to energy saving

Feed Tube and Nozzle is the Water Feed Tube Inside the Humidifier, Which Connects the Solenoid Valve and Then to the Nozzle at the Top of the Unit, Which Connects to the Distribution Tray

Aprilaire 4231 yellow orifices are the tiny nylon components which, accurately meter the flow of water into your humidifier

They allow a specific amount of water to go into the humidifier, unique to your model humidifier

Used in Models 400, 400A, 400M, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 568, 600, 600A and 600M

Resistant to moisture and microbial growth

Extremely low pressure drop and high dust-holding capacity

Pleats hold together even when wet, preventing delaminating, excessive buckling, collapsing, racking, warping and bending

Low initial resistance contributes to energy saving

Resistant to moisture and microbial growth

Extremely low pressure drop and high dust-holding capacity

Pleats hold together even when wet, preventing delaminating, excessive buckling, collapsing, racking, warping and bending

Low initial resistance contributes to energy saving