Jb616gc In reference to your comment that appears to have been removed about pulling the filter.. i think the older fellas mean if your not home to deal with it. Id say so long you have solid duct far enough out from plenum an good clearances around duct pipe it would prob be ok ya know. I just thought it was good advice from some of the guys on here about considering what may occur in a power outage an we cant be around to deal with it. Double D had good points about air flow and hes right i noticed better airflow on side to side setup over front to back. I think it was double d who commented there.