Unfortunately, I have some specific non-commodity circuit boards I'm dealing with, so I have to accommodate their environmental requirements.
On Mon, Jun 17, 2013 at 01:22:26PM -0700, david peahi wrote: > I have had success with the opposite approach using equipment rated from > -40 C to +85 C (+185 F), no fans, sealed NEMA4 or NEMA12 Hoffman > enclosures, cooling by equipment heat sinks. Ethernet switches and optics > rated -40 C to +85 C > This configuration has worked with the same equipment for at least 6 years > in an environment where summer ambient temperatures reach 120-130 F, and > winter ambient 0 F. Hoffman makes a 72" high NEMA12 enclosure with a > swing-out 19" telco rack. > > > On Mon, Jun 17, 2013 at 12:36 PM, Chuck Anderson <c...@wpi.edu> wrote: > > > I'm in need of my first free-standing, pad-mounted outdoor enclosure, > > 19" rack rails, 12-18 rack units, with about 400W of heat load inside, > > for use in the Massachusetts climate. What do people recommend as far > > as contruction, cooling/heating options, NEMA ratings, security > > options, etc. for this use? > > > > I was hoping to keep the inside temperature between 50 and 85 degrees > > Fahrenheit, although my worst-case components are rated for 41 to 104 > > F (4 - 40 C). If a full mechanical A/C system can be avoided, even > > better. A thermo-electric cooler would be nice. > > > > Thanks.