Ventilation Products


Solid state variable speed control

The DIAL-A-TEMP is a long lasting, solid state motor control. It is both convinient and safe to install. Rugged construction inside and out... uses thermally protected, permanent split capacitors (PSC), universal or shaded pole motors and packaged in a handsome fire-retardant thermoplastic enclosure.

Plug-in ground design - no tools required

UL Recognized components

Fire retardant thermoplastic enclosure

Rugged construction and compact

Maximum rating of 300W / 2.5 Amps

@ 77°F (25°C)

115 Volts - 50/60 Hz

Variable speed to control wood and coal burning fireplace and stove fans

-also incadescent lamps

On-Off switch, high to low variable

No internal wiring - just plug in and enjoy

One Year Warranty

Helps reduce fan or blower noise

Design features

Saves cash

Saves energy

Saves installing time


Solid state AC motor speed control

The variable speed motor control contains an On/Off line switch and a high gain RFI noise suppression filter. Applications include range hoods, vibrators, humidifiers, fireplace blowers, fans, laminar flow hoods, heat tunnel sand stirrers.



Backdraft dampers

Features & benefits


All dimensions in inches

Spring loaded backdraft dampers

Pressure switch


4" Lint trap

Lint trap surface mounted

Painted galvanized metal lint trap for dryer boosting applications. Use when duct length between dryer and booster fan is less than 15 feet. Fits 4-inch duct. Features pull out door with view window, removable lint filter for easy cleaning and 1/2” flange for flush mount installation.


Mounting brackets

Suitable for VTX Series models


All VTX Series products come with a mounting bracket included.

Optional galvanized mounting brackets for horizontal or vertical installation.  (sold separately)

Suitable for V-Series models V-12XL & V-14XL


VTX1200L & VTX1200


VTX600, VTX800L,

VTX800 & VTX1000

Vertical installation

Horizontal installation





Model  APS-0001

Air pressure sensing switch with fixed set point

Mounting position :  Mount with the diaphragm in any vertical plane to obtain specified operating set point.

Set point :  Fixed to operate on pressure rise at 0.05±0.02”w.c. (1.27±0.508 mm)

Switching differential (approximate) :  0.02±0.01”w.c.  (0.508±0.254 mm w.c.)

Measured media :  Air, or combustion byproducts that will not degrade silicone.

Maximum pressure :  1/2 psi (0.03 bar)

Operating temperature range :  -40°F to 180°F  (-40.0°C to 82.2°C)

Life :  100,00 cycles minimum at 1/2 psi maximum pressure each cycle and at maximum rated electrical load.

Electrical rating :  300 VA pilot duty at 155 to 277 VAC, 15 amps noninductive to 277 VAC, 60 Hz.

Contact arrangement :  SPST-NO

Electrical connections :  Screw-type terminals.

Sample line connector :  Barbed 1/8” - 1/4” slip-on connector accepts flexible tubing.

Shipping weight :  1.2 lbs.

Approvals :  ETL

Functional specifications

Integral recycling delay timer with 10 minutes ON, 15 seconds OFF cycle, 120 volt input.

Power :  120 VAC +10%/-15%, 50/60 Hz.

Timing range :  10 minutes (600 seconds) ±10%

Output :  SPST NO relay rated for 8 amps (resistive) @ 250 VAC or 1/8 hp @ 250 VAC.

Electrical connections :  Terminal block with clamp-type screw connector suitable for 12-26 AWG.

Temperature range :  -40°F to 140°F  (-40°C to 60°C).






Neoprene damper seal minimizes leakage

Requires from 0.04 to 0.08 inches wg pressure to open

Simple installation in any position -

entire assembly inserts into duct



VTX400, VTX400P

VTX500 & VTX600L

Middle bracket does not apply with models

VTX400, VTX400P, VTX500 & VTX600L

Mounting brackets




Current-Operated Solid-State Relays for Switching AC Circuits

AC Current Switch


All models are designed for mounting in a 2” X 4” electrical wall box


The ACS-0 and ACS-5 products are solid-state current switches with N.O. triac outputs to control high-current line-voltage AC loads. The ACS-0 and ACS-5 models have a factory set trip level of approximately 1 Amp and require no field adjustment for easy installation. Internal circuits are powered by induction from the line being monitored and all models are cULu certified.


Direct control of AC loads, such as dryer booster fans, in response to the current of a monitored AC circuit.


Self-powered and no insertion loss

True digital switching and no leakage

Small compact size

Input / Output isolation via current transformer

Solid-state reliability

Solid, reliable mounting method


Maximum Core Current :  50 Amps

Operating Temperature :  0 to 40oC  (32o to 104oF)

Trip Set-Point :  Approximately 1 Amps

Enclosure Size (H x W x D) : 49 x 87 x 25mm  (1.95” x 3.45“ x 1”)

AC Conductor Hole :  20mm (0.8“) Diameter

Switch Rating :  120 Vac @ 2.5 Amps Max.

Turn on time :  <200 mS

ACS-0 turn off time :  0 minute (factory set)

ACS-5 turn off time :  5 minutes (factory set)

Operating Humidity : 0 - 95% RH non-condensing

Material :  UL 94V-0 flammability rated ABS Insulation Class 600V

Mounting Holes :  2 x 5mm holes spaced 76mm on base (2 x 0.19” holes spaced 3” on base)

Switch Type :  Solid-state triac

Off-state Leakage :  <1 mA

Product ordering information

Exhaust Fan

Power Supply

120 Vac Max

Power to







Exhaust Fan

3-Phase Wiring

Exhaust Fan

Power Supply

120 Vac Max


Exhaust Fan

Power to


220 Vac

3-wire single-phase


Dryer Booster Fan Operation

The ACS-0 and ACS-5 can operate a dryer booster fan directly. These devices sense when a clothes dryer is drawing 1 Amp of current and then closes the output switch to activate the dryer vent booster fan. When the dryer cycle is complete and the current drops below the threshold, the output switch will open again (with a 5 minute delay for the ACS-5). The device output can switch 120 Vac loads up to 2.5 Amps.