Originally Posted by CR94
Originally Posted by ZeeOSix
... There have been photos posted in this forum of how much rubber covers the holes in a case like this ... approx 1/3 of each hole is covered by the ADBV. That reduces inlet hole flow area, which increases delta-p across the whole filter ... At any rate, I wouldn't want all the base plate holes 1/3 covered up. ...
How the cuts increase the hole coverage is not clear. In any case, blocking one-third the total inlet hole area will not significantly affect overall pressure drop.
Nobody has answered my question whether testing has proven such cuts actually allow "drain-back."
Blocking off 1/3 the flow area isn't helping, just like choked down louvers - both cause some increase in flow resistance, therefore causing more delta-p. I'd rather use filters without added delta-p due to bad engineering or sloppy quality - subpar products aren't worth using to me.
Originally Posted by ZeeOSix
... There have been photos posted in this forum of how much rubber covers the holes in a case like this ... approx 1/3 of each hole is covered by the ADBV. That reduces inlet hole flow area, which increases delta-p across the whole filter ... At any rate, I wouldn't want all the base plate holes 1/3 covered up. ...
How the cuts increase the hole coverage is not clear. In any case, blocking one-third the total inlet hole area will not significantly affect overall pressure drop.
Nobody has answered my question whether testing has proven such cuts actually allow "drain-back."
Blocking off 1/3 the flow area isn't helping, just like choked down louvers - both cause some increase in flow resistance, therefore causing more delta-p. I'd rather use filters without added delta-p due to bad engineering or sloppy quality - subpar products aren't worth using to me.