There are many less expensive options than buying new exhaust fans and shutters. I have not purchased a new fan or louver for any of my three greenhouses but I keep my eyes open for deals,usually at farm auctions, for deals a a fraction of the new price. There are a few tips on what you should look for when purchasing used fans. First a functional louver is important. If it is bent or sticks it will be a headache to correct. When looking for a fan I prefer one with a pulley and belt and look for a motor mount that is common to replace. Motors are more easy to find and replace this way and your fan housing will usually outlast anything else. You can get by without an intake louver if your greenhouse isn't very tight or you you physically open a door or window at an opposing end of your greenhouse prior to turning on the fan. Motorized louvers on a thermostat sure simplify things in your absense. I'm wiring in some extra fans and another louver this spring and I find that the wire and fixture costs can be substantial too. Plan your wiring to add more extras over time(circulation fans, lights, outlets).

Wow two replies and two direct bullseyes!!! Thanks folks, I had surfed 'til I nearly drowned on this subject and couldn't find a thing--I was THAT CLOSE to suffering the extreme humiliation of having to call the mfr about this! ;) >Apparently the motor is a powerful magnet motor because if it was a brush type it would burn up. Dunno what a "magnet motor" is gardenerwantabe but like you I tried to hold it with my hand and it clearly was Not about to yield to me! >I found that the bar is DESIGNED to stop the motor arm Good story gardnergal; something that confused me was in the motor instructions where it says "don't let the armature be stopped by the motor housing" which implied to me that it would grind itself up. Apparently that warning is just to assure the shutter opens fully!!? Thanks again; you-all have reassured Me and no doubt future generations of hobby GH builders (who use google)! Maybe when I get a rainy day I will email the mfr and suggest a Sequence of Operation paragraph for their "installation instructions"!

It is reasonably common for the throttle shaft to get "varnished" during storage and stick. So if this is the first real run of the season, see if you can move the throttle shaft with your finger tips. If in is dificult to move, work in some spray carb cleaner or other solvent as you try to free up the shaft. If the shaft moves easily and still races, possible the shutter that attaches to the shaft in the carb is loose.

Shutter speed is the time that the shutter stays open on the camera. The longer the shutter speed, the more light is let in and the brighter the picture. Some cameras allow infinite light exposure so you will need to use a smaller aperture setting. The shorter the shutter speed, the less light is let in to the film, and the darker the picture. Shorter shutter speeds can be from 1/250 of a second up to 1/3200 sec. In bright outdoor sunlight, generally a shorter shutter speed is needed. For late evening or night pictures, and much longer shutter speed is needed. Kt