Flexner on Finishing by Bob Flexner

Author:Bob Flexner
Language: eng
Format: epub
Tags: epub, ebook
Publisher: Penguin Publishing Group
Published: 2010-04-15T00:00:00+00:00

You can create an efficient, safe and inexpensive spray booth that takes up minimal floor space with just a fan, separate motor, plastic curtains and some plywood or particleboard. Very little woodworking is required but you will need to adapt the design to your own situation.

Steel construction for fire safety.

Filters to catch and hold overspray before it is drawn into the fan.

A chamber for collecting the air to be exhausted after it has passed through the filters. This exhaust chamber makes it possible for air to be drawn uniformly through a much larger square footage of filters than just the simple smaller diameter of the fan.

A large enough fan to create an air flow of 100 feet-or-more per minute, which is enough to pull “bounce-back” overspray away from the object being sprayed. The fan and motor are also “explosion proof” to eliminate the possibility of sparks causing a fire or explosion it they come in contact with solvent vapors. (Be aware that a buildup of vapors can be ignited by a pilot light in your furnace, your water heater or from another source in your home, also.)

Side walls and a ceiling to create a work chamber or “tunnel” for directing the flow of air over the work being sprayed and through the spray booth's filters.

Ceiling and sometimes side lighting so the operator can see a reflection off the surface he or she is spraying. (Working with a reflected light source is the only way an operator can know if the finish is being applied wet and without orange peel, runs, sags or other problems.)

Commercial spray booths are an essential tool for production shops, but these booths are too large, too expensive ($3,000 to $5,000 minimum) and require too much make-up air (heated air to replace the air being exhausted) for almost all home shops. If you are using a spray gun on an infrequent basis at home and have to work inside to avoid cold, wind, bugs, falling leaves and so on, you should consider building your own modified spray booth.

Making Your Own

With a note of caution that doing any type of spraying in your house, with or without a spray booth, could affect your homeowner's insurance, here's how to build a safe, inexpensive spray booth that will be adequate in the volume of air and overspray exhausted and take up very little space.

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