From 
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1. Select the most direct route for the vent with the fewest possible turns. Measure the length of the run, note the bends, then buy the duct required.
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2. Mark the center of the rim joist and drill a test hole with a 1/4-in. bit. Locate the hole outside and check for obstructions.
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3. Shift the hole so the top of the vent cap rests on the high point of the lap siding. Pull the vent cap and duct apart to make measuring easier.
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4. Bore a 4-1/4 in. hole with a hole saw. Hold the drill level and steady. Pull the drill back frequently to clear the sawdust and let the drill motor cool.
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5. Stop and pry out siding and sheathing from the saw as you go. Then continue your cut through the rim joist.
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6. Insert the vent and screw the cap to the house (predrill screw holes). Push foam backer rod into deep gaps, then caulk all around with acrylic caulk.
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7. Cut the straight sections to length with a tin snips before you snap the seams together. Wear leather gloves—the cut metal edges are sharp.
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8. Align the seam edges of the duct. Then, working from one end, push the edges down slightly as you force them together.
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9. Start at the dryer and insert the crimped end of the first elbow into the first straight section. Tape the joints with metal foil tape.
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10. Slide the first fitting onto the dryer and push the dryer against the wall. Measure, cut and assemble the other duct
sections.
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11. Slide the last elbow onto the straight section coming up the wall, then push the crimped end of the elbow into the duct cap section. Tape it.
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12. Anchor the duct to walls or ceilings every 6 to 8 ft. with a pipe strap. Loop the strap around the duct; don’t screw the strap to it.
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