This circuit board is located inside the humidifier and controls the small fan motor located in the fan powered humidifier
• Includes wiring harness
• The circuit board also includes a relay and transformer that supply 115 volt to a fan motor and 24 volt to solenoid when needed
  

  Aprilaire 4238AA

Aprilaire 4079AA

Aprilaire 4028

Air filters helps to keep HVAC equipment running at peak efficiency
• Media replacement is recommended after 1 year
• MERV 11 media permanently traps up to 95% of pollen-sized particles (10 micron) and up to 94% of mold and spore-sized particles (6 micron)
• Collapsible media with self spacing pleats installs in seconds
• SelfSeal dramatically reduces air bypass, improving media performance
• Exclusive media design protects replacement media business
  

  Aprilaire 410AA

Aprilaire 4040AA

Aprilaire 4231AA

The Aprilaire 4270 pleat spacer combs are the large black plastic pieces that help secure the filter to the PVC housing of the air cleaner, as well as separate the pleats of the filter
• This item never wears down, but may break
• Each air cleaner takes 6 of these, but since you rarely need to replace all 6, we are offering them on an individual basis
  

  Aprilaire 4270AA

Aprilaire 4232AA

Aprilaire 4010AA

Aprilaire 4119AA

Aprilaire 413AA

Aprilaire 4236AA