I have forced hot air for heating as well. I put some filter material on the inside of the grill on the INTAKE vents. This prevents any additional "stuff" getting into the venting system. It has been a year now, and I am AMAZED at how mucch "stuff" collects on the vent. (I just vacuum it away, no need to bend over or anything.) This doesn't cost much except some time, and it benefits all who live in the home. Might be something you want to consider.
I used paper clips and those black gripper clips (office supplies) to attach the material to the inside fo the grill.
Prayers that the pills and shot work!






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