Electro-Air Replacement Pre-Filter # DMH4-0855
Prefilter (Gold), Merv 11, 16 x 12 x 1"
Prefilter Part #DMH4-0855 is Recommended to be changed every 3-6 months
Electro-Air Model EA HEPADM400
Direct Air Model 400
Other related part # ( sold separately) or recommendations:
Hepa Media Filter Part #DMH4-0400 is Recommended to be changed every 2-3 years
Carbon Prefilter Part #DMH4-0810 is Recommended to be changed every 3-6 months