Viking PDS-21 Pressurized Wall Cavity Dryer (PDS-21)

List price: $1,500.00
You save: $321.00 (21%)

Viking PDS-21 Pressurized Wall Cavity Dryer. Unlike other in-wall drying equipment, the PDS-21 is engineered without an air mover motor, squirrel cage or other attachments. The PDS-21 Pressurized Drying System quickly delivers dry heated air that is perfect for drying under sinks, behind cabinets and permanent furniture.

This portable unit features a lightweight, stackable design that includes a built-in cord wrap. The frustration free PDS-21 is easy-to-use on big and small jobs alike.

The unit's airtight housing contains a specially designed two-stage tangential by-pass vacuum motor that pressurizes and heats air up to 205°F (95°C) prior to discharging it.

Use the heated pressurized airflow to efficiently dry under sinks, behind cabinets and fixed furniture. The 2.6 horsepower motor produces an airflow of 92 cubic feet per minute while drawing only nine amperes of electricity.

For in-wall drying, simply attach the tubes to the air nozzles on the front of the unit, drill a few half-inch holes in the wall, insert tube ends and switch on airflow. A thermal protection switch with auto-reset has been installed to protect the unit from overheating.

The offered flexibility and beneficial features of the PDS-21 make it a next-level piece of equipment for any restoration contractor. It’s the restoration industry's strongest return on investment.


  • Heated pressurized air flow for optimal wall cavity drying
  • Self-healing/auto restart thermal protection safety feature
  • On-board plug-off system improves drying capability with increased pressure
  • Strong return-on-investment that drives revenues and pays for itself in a few jobs
  • Built-in cord wrap for easy storage without messy cords hanging
  • Easy grip handle for easy portability from storage to jobsite
  • Comes with 2 100ft rolls of tubing for increased drying coverage
  • Lightweight & stackable to maximize storage space


  • Motor:  2-stage tangential by-pass
  • Rated Airflow:  92 cfm
  • Speed:  1
  • Voltage:  115 v
  • Amperage:  9.3 
  • Static Pressure:  3.125"
  • Vacuum:  106 inches
  • Operating Temperature:  Up to 205°F (95°C) 
  • Air Nozzles:  21
  • Power Cord:  25 ft
  • Tubing:  3/8 id 1/2 od black (200 ft.)
  • Housing:  Roto molded polyethylene
  • Stackable:  Yes
  • Safety Certifications:  UL approved motor
  • Thermal Protection:  Thermal protection switch with auto reset
  • Unit Weight:  19 lb
  • Unit Dimensions (LxWxH):  20.5" x 16.7" x 18.5"
  • Box Weight:  35.6 lb
  • Box Dimensions (LxWxH):  21" x 19" x 22"
  • Xactimate:  WTRWALL (Wall Cavity Drying -inj. Type)
  • UPC:  848025012529
  • Product Code:  PDS-21

What's in the Box? 

  • PDS-21 Wall Cavity Dryer
  • 100 Ft of Tubing
  • 21 Hole Brass Diffuser
  • Owner's Manual

Manufacturer's Limited Warranty

  • 5-Year Warranty on Housing
  • 2-Year Warranty on Labor
  • 1-Year Warranty on Parts
Dim Height:
18.5 inches
Dim Length:
20.5 inches
Dim Width:
16.7 inches
Roto Molded Polyethylene
Max. Airflow
92 cfm
Power Draw:
9.3 amps
Shipping Weight
36 lbs
Static Pressure
3.125 inches
Tube Diameter:
19 lbs

Air Mover

Air Mover Type:

Manual (Viking_PDS-21_Pressurized_Wall_Cavity_Dryer_Manual.pdf, 433 Kb) [Download]

Parts List (Viking_PDS-21_Pressurized_Wall_Cavity_Dryer_Schematic.pdf, 433 Kb) [Download]

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