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Quest PowerDry 850D Pro

The Quest PowerDry 850D Pro Desiccant provides the perfect blend of portability, versatility, and performance in a medium-capacity desiccant dehumidifier. It combines the wide operating range and ultra-low grains of the Quest PowerDry 1200D Pro with the portability of a refrigerant dehumidifier like our Quest PowerDry 4000 Pro. The included remote humidistat and process blower speed control allow you to tailor the drying to the task at hand. The 850D operates both vertically or horizontally and is perfect for low clearance applications, fitting inside most crawlspaces. The lower carrying handle makes moving the unit down stairs, as well as into and out of a crawlspace, a breeze.

The PowerDry 850D delivers 850 CFM of ultra-low grain process air and removes a stunning 370 pints per day at AHAM conditions. The true four-hole design* allows for positive, neutral, or negative pressurization of the affected area.

Power to the unit is provided by either a 30- or 50- amp, 230-volt grounded power cord (both are included). The reactivation air stream is ducted through 6” flex duct, which is also provided with the unit.

*Having completely separate process and regeneration airstreams.

370 pints per day

Standard conditions are determined by the American Home Appliance Manufacturers (AHAM) and are used because capacity will vary with conditions. AHAM standard rating conditions are 80ºF and 60%RH. At these conditions, the capacity of the Quest PowerDry 850D Pro is 370 pints per day.


Quest PowerDry 850D Pro Specifications

Part No.: 4034010
Power: 208-240VAC, 50/60Hz, Single Phase
30A or 50A branch circuit protection
(24A or 40A actual amp draw)
Water Removal: 370 pints/day
@ AHAM (80°F, 60%)
Blower: 850 CFM Process Airflow
225 CFM Reactivation Airflow
Operating Temp.: -10°F to 120°F
W x H x D: 20″ x 41″ x 23¼″
Weight: 155 Lbs.

Optional Accessories

4026859 6” Metalized Polyester Flex-Duct 25’ (Standard)
4020128 6” Insulated Flex-Duct 25’
4024750 12” Metalized Polyester Flex Duct 25’
4023643 18” Metalized Polyester Flex Duct 25’
4022537 10” Lay Flat Duct 500’
4024440 Kestrel 3000 Multi-Function Air Meter
4030115 Reed LM 8000 Multi-Function Meter
4027326 25’ 240V Cord Kit
4031045 50’ 240V Cord Kit
4031046 75’ 240V Cord Kit
4031047 100’ 240V Cord Kit
4036662 Remote Humidistat
4024935 10” Lay Flat Duct 250’


  • 850 CFM of Process Air Flow
  • Ultra-Low Grains for Max Water Removal
  • True Four Hole Desiccant
  • Operates Vertically and Horizontally
  • Runs on 240V 50A or 30A Connections
  • Small Size and Weight
  • Legendary Stainless Construction

Any Questions?
Call us toll free at 866-933-7486 to speak with our product experts. Or contact us here.

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