01 · Crawl space dehumidifiers
HD55S and HD55P: one letter, different filters
The store groups HD55, HD55S, HDi65 and HDi65S under one MERV-1 filter listing. The HD55P has its own pack with a different part number. Another filter fits the HD35P and HS35.
For HD55S / HDi65S
MERV-1, pack of 4 · SKU 160300109
For HD55P
MERV-1, pack of 4 · SKU 160300155
AlorAirCrawlspace photos from the Awin affiliate catalog. Products are not shown to scale.
| Your unit | Replacement filter |
|---|---|
| Sentinel HD55 / HD55S / HDi65 / HDi65S | MERV-1, pack of 4 SKU 160300109 |
| Sentinel HD55P | MERV-1, pack of 4 SKU 160300155 |
| Sentinel HD35P / HS35 | MERV-1, pack of 4 SKU 160300148 |
| Galaxy 60 / 60P / 85P | MERV-1, single filter |
For the HD55S and HDi65S, AlorAir also offers a single MERV-8 filter. Choose your model first, then the filter rating you need.
Galaxy 60, 60P and 85P share a MERV-1 filter. The table links to a single-filter listing that names all three models. [4]
02 · Restoration equipment
Replacement filters for Storm
| Your unit | Replacement filter |
|---|---|
| Storm 80X | MERV-1, pack of 3 |
| Storm LGR Extreme | MERV-8, pack of 4 |
| Storm SLGR 850X / LGR 850X / LGR 850 | MERV-1, pack of 3 MERV-8, pack of 3 |
The 850 family has separate MERV-1 and MERV-8 listings. Match the rating on the filter you are removing and the unit's model name to the replacement listing. Follow your version's manual for installation.
The production year can matter too
Storm Pro/Ultra units made before 2023 have a separate MERV-8 filter listing. [10] The MERV-1 listing for newer HD90/HDi90 units with a built-in pump specifies four screw holes and uses S39037 as the serial-number boundary. It does not explain which filter fits a unit numbered exactly S39037. Send the seller a photo to confirm that case.
03 · Air scrubber
Two replacement stages for CleanShield 550
The CleanShield HEPA 550 prefilter and HEPA/carbon block are sold separately. They have different dimensions and fit in different positions.
| Filter stage | Replacement filter |
|---|---|
| Prefilter | MERV-10, pack of 10 13.7 × 14.8 × 0.8 in |
| Main filter | HEPA with activated carbon, pack of 3 17.2 × 15.3 × 2 in |
To compare prices, divide the pack price by the number of filters of that type. For the unit's design and maintenance, see our CleanShield 550 review.
04 · Controls
Controller upstairs, dehumidifier below
A wired controller lets you adjust settings from an accessible location. The Sentinel RF-KZQA01-A1 has its own sensor and connects through a 25 ft CAT 5 cable. Its listing names HD35P, HD55P, HDi65, HD90, HDi90, HD55, HDi100 and HDi120. HD55S and HDi65S are not named in that list; ask the seller to confirm those models before buying this controller.
Sentinel controller
RF-KZQA01-A1 · Wired connection
Hanging kit
RF-B89901-1 · Adjustable straps
AlorAirCrawlspace photos from the Awin affiliate catalog.
Galaxy 60, 60P and 85P have a separate RF-KZQA04 wired controller. It turns the unit on and off, sets humidity and displays temperature.
05 · Installation
Hanging kits and ducting
The RF-B89901-1 hanging kit suspends a dehumidifier beneath floor joists using four adjustable straps. The store lists HD55/HD55S, HD90/HDi90, HDi100/HDi120, HDi65S, HS35, HD35P/HD55P and Galaxy 60/60P/85P. Hanging the unit frees the space below it; leave access to the filter and drain.
16-inch inlet duct
CleanShield 550 · RF-BZJPJ01
8-inch outlet duct
CleanShield 550 · RF-BZJPJ02
WHD backdraft damper
10-inch · RF-BZJPJ11
Product photos from TheDryAir and AlorAirCrawlspace. Products are not shown to scale.
CleanShield 550
CleanShield 550 accepts a 16-inch inlet duct and an 8-inch outlet duct. Both compatibility lists name CleanShield 550.
Sentinel WHD
The 10-inch RF-BZJPJ11 backdraft damper fits WHD100/120/150/200. It prevents reverse airflow when the fan stops.
Match ducting to the inlet or outlet connection and its diameter. Use the dehumidifier's installation diagram to position the damper.
06 · Before ordering
If your model is missing from the list
Photograph the unit's label and the old part. For a filter, include the frame dimensions; for a controller, photograph the connector. Send these details and a link to the accessory so the seller can check your version.
Compatibility in this guide comes from the accessory listings. A similar model name does not confirm a match when your model is absent.
Documentation
Sources
AlorAir and AlorAirCrawlspace listings checked on October 13, 2026. Product links go to affiliate stores TheDryAir and AlorAirCrawlspace. Compatibility is stated by the supplier; we have not independently tested these parts.
- MERV-1 for HD55/HD55S/HDi65/HDi65S
- MERV-1 for HD55P
- MERV-1 for HD35P/HS35
- MERV-1 for Galaxy 60/60P/85P
- MERV-8 for HD55S/HDi65S
- MERV-1 for Storm 80X
- MERV-8 filter for LGR Extreme (pack of 4)
- MERV-1 filter for SLGR 850X / LGR 850X / LGR 850 (pack of 3)
- MERV-8 for the 850 family
- MERV-8 for Storm Pro/Ultra made before 2023
- MERV-1 for newer HD90/HDi90
- CleanShield 550 prefilter
- CleanShield 550 HEPA/carbon block
- Sentinel RF-KZQA01-A1 controller
- The RF-B89901-1 hanging kit
- Galaxy RF-KZQA04 controller
- 16-inch inlet duct
- 8-inch outlet duct
- WHD RF-BZJPJ11 damper