On May 12, 12:31*pm, DerbyDad03 wrote:
On May 12, 2:36*pm, "Joseph Meehan"
wrote:



"DerbyDad03" wrote in message

...

On May 12, 10:38 am, Eric in North TX wrote:
On May 12, 9:05 am, wrote:

...

you could always change out the intake grills to ones that take
filters

Replacing the single filter with multiple filters at the intakes could
restrict air flow to the system making it work harder or be less
efficient....

* * More likely it would reduce the restriction since it would be equivalent
to using a larger filter. *Just make sure the original filer is removed and
that any opening at that point is sealed.

What am I missing?

Let's say your system has a 20" x 20" opening (400 square inches) with
a single filter causing some amount of restriction. This restriction
could be measured on a per inch basis, determined by the filter
material.

In this same system, ahead of the single filter, you've got 10
intakes, all measuring 10" *x 5" *(500 square inches) unrestricted by
a filter.

Now you pull the single 400 square inch filter and replace it with ten
50 square inch filters, each of whom restrict the same amount of air
per square inch.

Haven't you restricted 100 additional square inches of opening - 500
instead of 400?



If you've been there a year and don't know when the system was
inspected last, it might make sense to schedule a check-up. When you
call to make the appointment, tell them you want to talk about
changing the filter layout and that you want to make sure that they
send out a knowledgable service rep.

--
Joseph Meehan

*Dia 's Muire duit

The pressure drop across each of the multiple intake filters is lower
than the pressure drop across the single filter.

Take the example to the extreme case.

Case one replace a single 20x20 with 10 ea 10x5's 400 sq in of
filter gets replaced by 500 sq in of filter

Case two replace the single 20x20 with 100ea 10x5 400 sq in of filter
gets replaced by 5000 sq in of filter

Now you're "restricting" 12x the area....will this help or choke off
the flow?

having a larger filter on your shop vac doesn't restrict the flow
more, a larger filter provides less restriction.
Tape over half of the filter....the vac will struggle.

Add a filter in parallel & the vac will not work as hard even though
you've "restricted" twice the area.

It's the concept of resistors in parallel.


cheers
Bob