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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
Quality Engineered
Expanded Metal Pleat Supports
Low Initial Resistance for Energy Savings
Consistently Produced
Made in USA
Quality Engineered
Expanded Metal Pleat Supports
Low Initial Resistance for Energy Savings
Consistently Produced
Made in USA
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