Venting [RE-wrenches]

[Peter Talmage]

Lyn,

We have put in many successful passive vents in our
systems. The key is to ensure that the vent runs all
the way to the peak of the roof and that its top is
above the peak. A  tee on top will keep most rain out
and a tee with a down pointing capped leg at the point
the pipe enters the battery enclosure will catch any
rain that gets in. For most runs we use a 3" pipe and
keep bends to a minimum and then 45 degree ones. Also
run the pipe in inside walls so it will stay warm and
you MUST insulate the pipe well if it goes through an
attic. If too much of the pipe gets too cold the air
flow will reverse.

Yours,  Peter Talmage

--- John Berdner <jberdner at sma-america.com> wrote:
> Lyn:
> 
> I would just go along with the inspector and install
> the 2" vent.
> 
> Others on the list have correctly stated that the
> code (NEC) does not
> normally require additional ventilation of battery
> rooms.
> Be careful though, the UBC (uniform building code)
> has some really ugly
> requirements for battery rooms - like 4 hour fire
> walls, and seismic racks.
> And then there are the eye wash stations and
> showers, etc.
> Normally we all think about the NEC but there are
> other requirements like
> the UBC and other local codes that MAY come into
> play.
> 
> I don't think I would want to take the risk of
> having an inspector look
> carefully at all of the various code requirements
> for battery rooms in an
> effort to justify his 2" vent.
> You might not be happy with what he or she finds
> out.
> 
> If you have any questions or I can be of any further
> assistance please do
> not hesitate to contact me.
> 
> Best regards,
> 
> John Berdner
> 
> SMA-America, Inc.
> 20830 Red Dog Road
> Grass Valley, CA  95945
> Tel: 530.273.4895
> Fax: 530.274.7271
> 
> -----Original Message-----
> From: Lynne A Carter [mailto:solarvil at netpath.net]
> Sent: Tuesday, May 15, 2001 9:14 AM
> To: RE-wrenches at topica.com
> Subject: Venting [RE-wrenches]
> 
> 
> I have a inspector asking us to put a 2"passive vent
> fan for the battery
> box.  We have a Vent fan in the system already it
> has Zephyr but he wont
> pass it until we add a passive vent. What do the
> wrenches think?
> Lyn
> Lyn at solarvillage.com
> Solar Village Institute inc.
> PO Box 14
> Saxapahaw, NC  27340
> Tel. 336-376-9530
> Fax. 336-376-1809
> www.solarvillage.com
> 
> 
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