How to Make My Generator More Quiet

Written by keith allen
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How to Make My Generator More Quiet
(Zedcor Wholly Owned/ Images)

A soundproof box or enclosure is among the best ways to lower the noise level created by a generator. While constructing a box to fit over the top of a generator is a simple do-it-yourself project, the materials required for soundproofing and the ventilation requirements of the generator make the project more complex.

Skill level:

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Things you need

  • Soundboard
  • Mass Loaded Vinyl
  • Foam mat
  • Glue
  • Blower fan
  • Flexible duct
  • Handles
  • Drill

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  1. 1

    Build a box that will fit over the generator leaving an air space of 6 to 8 inches between the box and any components of the generator. Build the box out of soundboard or medium density fiberboard rather than wood. Wood conducts vibrations and sound while the alternate building materials serve as a soundproofing medium. Wood can be used, if necessary, to provide structural strength or waterproofing.

  2. 2

    Line the interior of the box with Mass Loaded Vinyl (MLV). This material offer further soundproofing and is glued in place. Glue another layer of soundproofing material, a foam mat is commonly used, to the interior of the MLV.

  3. 3

    Add ventilation holes or vent fans. The simplest vent system is to drill holes 1 ½ inch holes through the materials. The number of holes will vary with the size of the generator and the climate it is operated in. Larger generators in warmer climates require a forced air venting system. Mount a blower fan, available at hardware stores and home improvement centres, to the top of the box. Use flexible duct to connect the blower to one of the ends of the box. Air blown into the box will exit through the vent holes.

  4. 4

    Fasten the box to the generator pedestal. Use removable clips to hold the soundproof box in place. Add handles to the exterior of the box to make removal of the box for maintenance easier.

Tips and warnings

  • Monitor the temperature of the air in the box during operation to prevent overheating. Adding blocks under the sides of the box to lift it off the pedestal will improve air circulation. Mount any ducting in positions other than straight lines. Air will curve around a bend in a flexible duct more readily than sound waves.

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