Why Is There An Odor From My Newly Installed Cooler Pad?

When a new Rigid Cooling Media pad is installed in evaporative coolers, there is usually a slight odor emitted.
This slight odor will dissipate and be gone after a short period of time.

When these pads are first wet out a slight odor may occur from the dust created when the pad is manufactured and cut to size.


The operation of this type cooling pad requires a wet out period (typically several hours without airflow) followed by draining and refilling the sump water pan. This will remove the small amount of residue in the media that would be the source of the odor. This operation may have to be repeated on larger systems that do not drain completely.

All evaporative cooling systems have odor problems related to the system cleanliness. This is how ‘swamp coolers’ first got its name. When left UN-cleaned, they would start to smell like a swamp. All cooling media require cleaning, both initially, and ongoing. All cooling pads of this type are manufactured using the same base resin materials and have the same odor associated with them. All new cooler pads have a ‘new pad’ odor that dissipates with use. Once the pads are ‘broken in’, this odor will disappear. The once active ingredients in the paper of the cooling pad are rendered inert during the manufacturing processing, however, the odor from these materials lingers until the pads are washed clean by the wetting process after installation.

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Installation Instructions

AeroCool Cooler Pads


Long Life – High Air Velocity – Energy Efficient
Consistent Performance50% heavier paper holds more water and lasts longer
Independent lab and field tests verify the highest efficiency
Fast wet-outEngineered for optimal performance and longevity…Cellulose base impregnated with plastic resins and anti-rot agents…Durable and easy to install.
Celdek Pads
Rigid Cooling Media Pad
Pad is not one piece
Comes in Sections
2 – 4 sections per set
to make correct width8″ & 12″ Thick Pads
The Most Efficient type of
Cooler Pad Made
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8″ Thick

P/N 3437
40 x 23 x 8
AeroCool 4800

$128 Total Cost

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8″ Thick
P/N 3439
40 x 30 x 8
AeroCool 6800
$158 Total Cost

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AeroCool Window Cooler Model
BW 5500 Brisa

New Rigid Cooling Media Pad type pads will emit a slight odor when first installed
Click Here To See Why