Retro Fit Soundproofing for
Generators with a Factory Fitted Enclosure
How to Retro Fit Your Existing Enclosure with Soundproofing
1. Stripping out the old ineffective foam
If the enclosure has got a convoluted foam inside the panels such in the image here, it needs to be stripped out. Hopefully by now you already understand why but to summarise it is:
a) Flammable
b) Has poor sound absorption (don't be fooled by the cone profile)
c) Has insufficient density to attenuate the noise
Steps:
● Use a paint scrapper and pull gently on the edge of the foam while using the scrapper at the back to work it free.
● Use a 150 - 180 grit sandpaper to clean the panel from loose bits
● Brush off to remove the fine dust
● In a well ventilated area, use a cloth to wipe down with acetone
2. Damp the Vibration that Leads to Noise
The operation of the generator causes vibration, which gets into the sheet metal housing, which causes noise. Sheet metal has two problems we need to overcome:
a) It conducts vibration / resonates easily = noise transfer
b) Has insufficient mass to attenuate the noise
The Solution
G-Damp anti-vibration mats are self adhesive and easy to apply with the supplied roller. They will follow the contour of the metal and are cut with a Stanley blade. G-Damp is flame retardant. Thickness: 2mm
By installing G-Damp you will damp the vibration and add mass in one cool manoeuvre. "Well done Ace! "
Steps:
● Measure the area where you need to apply the G-Damp
● Cut to size with a sharp blade
● Apply even pressure across the whole mat, with the roller
● Before you complete the job, tap on an untreated area & then a treated area to hear the difference.
● Continue until all bare areas of metal are covered. It's fine to overlap joins.
Top Tip:
The only thing better than 1 layer of G-Damp, is 2 layers of G-Damp.
Apply G-Damp over itself, to double up for an even greater effect.
i.e. More mass = Better attenuation
3. Install LF125 Slim Fit Sound Absorption Panels
The last thing we want is a hollow, resonant space inside the housing, so now you're going to install the LF125 slim fit, sound absorbers.
● The slim fit panels are only 25mm thick
● High density, probably 2 - 3 times greater than the old foam
● Higher density = greater sound attenuation
● Non-flammable
Steps:
● Measure the area where you need to apply the absorbers
● Cut to size with a sharp blade
● Finish off any raw edges with the supplied spare finishing cloth
● Mask off any areas where you don't want adhesive. Apply the contact adhesive with the supplied spray can, to both surfaces.
● Line up the panel and apply with even pressure
● Continue until all accessible areas of metal are covered
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