Relevancia de los distintos regímenes matrimoniales

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When the Job’s Done

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Woodworker David Marks uses inexpensive furnace filters fitted into cutouts in the door to his finishing room to allow proper ventilation yet prevent dust generated in his adjoining woodshop from ending up in a freshly finished turning or furniture piece.

Ventilating Your finishing area

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The temporary booth that wood-finishing expert Michael Dresdner uses for spraying water-based fin-ishes is made from panels cut from a corrugated- cardboard appliance carton.

Air is drawn through the knockdown booth by a pow-erful exhaust fan mounted to a wheeled dolly.

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While you might get away with squirting a little finish from a spray can on a small part inside the shop, doing any serious amount of spraying puts out too much finish in the air for basic shop ventilation to handle. A spray booth should be used to keep the large volume of fumes gener-ated during spraying from accumulating.

Using a booth keeps the air cleaner to breathe and reduces the possibility of a fire when spraying flammable finishes.

Just as important, a booth keeps over-spray (finish particles that don’t end up on the workpiece) out of the shop.

While spray finishing outdoors is an alternative, a good spray booth lets you spray finishes inside the shop more cleanly and predictably. A basic booth is simply a partially enclosed air funnel:

You stand at one end of the funnel and spray toward a fan at the other end that draws clean air past you and sucks fume- and overspray-laden air out of the shop.

A filter over the fan keeps overspray from building up on it.

Folding spray booths When most people think of a woodshop spray booth, they think of a commercial type of metal booth that’s large, expensive, and per-manently installed. While this kind of booth is right for pros (see the photo on p. 94), you can make your own booth that’s great for a small shop, one that’s inexpensive to build and folds up and stores out of the way when not in use.

You can build a full-size folding booth, which is big enough for spraying all but the largest furniture pieces and cabinets, Heating and Ventilation

vacuumed before use. Because ventila-tion is most effective when the spray gun is pointed toward the fan, it’s best to put the work on a turntable of some kind, so it can be rotated during spraying.

• A mini-booth If you spray only small parts occasionally, you can build a petite version of the cardboard spray booth, shown in the photo above. Three pieces of cardboard are hinged together with or a pint-size version, which you can set

up in a window or doorway for spraying small parts.

• Full-size version Designed for use with nonflammable water-based finishes, the large folding booth shown in the photo on the facing page is constructed from heavy, corrugated cardboard, the kind that refrigerator boxes are made of (ask for a discard at your local appliance store). The booth is made from six pieces that are roughly 3 ft. by 6 ft. each. Five pieces are hinged together with duct tape so that they’ll fold in zigzag fashion, ending up as a flat bundle that’s easy to store. The lower edge of the middle side is cut out to fit the exhaust fan, which should be a box fan or ventilation fan capable of moving 500 cfm of air or more. The inside surface of the fan enclosure is covered with spun-fiberglass filter material, which is available by the foot at home-supply stores.

The sixth piece of cardboard acts as a partial top for the booth, with a 1-in. by 3-in. wood reinforcement strip mounted on its forward edge. Velcro® strips on the lower edges of the top lock into mating Velcro glued to the top edges of the sides. These keep the top in place and allow the angle of the sides to be adjusted—more obtuse for large work-pieces; more acute for small stuff.

Before use, the booth is set up in front of an open garage door or large doorway, and windows or doors are opened on the opposite side of the shop to create flow-through ventilation. Both the booth area and any loose dust in the shop must be

A box fan, a furnace filter, three pieces of cardboard, and a little duct tape are all it takes to build a simple spray booth that sets up in minutes in front of a win-dow or doorway, allowing you to spray-paint or clear-finish parts and small projects.

Ventilating Your finishing area

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Every component of a proper spray booth, such as this metal booth used by master guitar builder Jeff Traugott, is designed to allow the application of toxic and explosive solvent-based finishes safely and in a way that is environmentally friendly.

duct tape, allowing the booth to fold flat. Tape holds the small, funnel-shaped booth to a regular box fan with a furnace filter taped on the intake side.

This mini-booth can be set up in min-utes on a bench in front of an open win-dow or on a stand in front of a doorway.

Again, a turntable (this time made from a couple of plywood squares screwed to a lazy Susan bearing) allows the workpiece to be spun around during spraying.

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