Guardian SN90
A high-capacity gravity-drain option with 90 PPD at AHAM conditions and 198 PPD at saturation. It is most relevant for larger crawl spaces where you do not need a built-in pump.
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- Larger crawl spaces that fit a roughly 90 PPD normalized class
- Installations with a reliable gravity drain
- Buyers comparing high-capacity direct-to-consumer units
- You need condensate pumped upward—the Guardian SNS90 is the pump variant
- Your space is small enough that 90 PPD would be unnecessary overcapacity
- You are comparing products only by the 198-pint saturation headline
Compare the test condition, not the biggest number
CrawlClimate uses the 80°F / 60% RH figure as the primary comparison value when the manufacturer publishes it. Saturation figures are kept separate because they are measured under much warmer, wetter conditions.
What stands out
- 90 PPD AHAM rating and 198 PPD saturation figure are both published
- 210 CFM airflow
- Manufacturer publishes operation down to about 33.8°F and a 5-year warranty
Potential limitations
- Gravity drainage only on the SN90
- Large physical size and weight compared with smaller classes
- MERV-1 filtration is basic
Before you order
Use the SN90 where a continuous gravity-drain path is practical. If your discharge point is above the unit, compare the Guardian SNS90 pump model instead of adding complexity after purchase.
Read installation guides →Specifications
Similar-capacity alternatives
Sources & testing status
This page is currently labeled Specification research. Specifications are based on published sources and have not been presented as a CrawlClimate hands-on test.