On Dec 30, 3:40�pm, werwer wrote:
Do they make a return air register with room for an air filter? �The
registers in my house are one stud space long - 16", and about 8 - 10"
high. �Thanks.

you can likely modify one to fit, the cheap cardboard and fiberglass
type.

the downside is it will decrease airflow and may raise heating and
cooling costs

a friends wife has too many birds, their dander clogs the furnace
filter.

he blocked completely the air return from the bird room.

no more troubles