So Simple, So Advanced!

The LintAlert® is a smart, easy-to-install home safety device that monitors and displays the back pressure levels found in the exhaust conduit of the dryer. Pressure levels found in the dryer duct typically increase over time due to lint build-up, animal nests or vent hoods that become inoperable.

The LintAlert® features an innovative and responsive digital pressure sensor. Coupled with a programmable integrated circuit, the device can determine if your dryer is ON, and what levels of pressure exist. When the pressure reaches an unsafe level, the alarm state will activate, indicating maintenance is required. The alarm state is displayed as: LED light bar flashes on and off alternating with blue logo, with buzzer beeping. Prior to the alarm state, a slow progression of the LED Blockage Indicator will display fractional build-up.

Disguised as a simple night light and pass through plug, the LintAlert exhibits a steady blue light under normal operation.

The included tap fitting is installed in the dryers' transition hose at or near the dryers exhaust port. The SmartTap™ fitting is connected to the alarm module by a 1/8" tube and allows the pressure differential switch to monitor the pressure in the flex transition hose and the balance of the exhaust conduit.

Because electrical outlets are generally at a minimum in the laundry room, a convenient pass through terminal is provided and is sufficient to carry a maximum of 15 amps.

Alarm Module

SmartTap
Fitting™

How We Tested

Several dryer manufacturers state in their installation instructions the recommended pressure in an acceptable exhaust system. The pressure is measured using an inclined manometer or Magnehelic Gauge. The three major appliance manufacturers differ slightly but average around .75 inches of water column of pressure for an exhaust conduit pressure to be unacceptable or too much for their equipment to operate safely.

In addition to the appliance manufacturers, associations like the Chimney Sweep Institute of America have a training manual for certified Dryer Exhaust Technicians (C-DET) and states .6 inches of water column (wci) as being a point where cleaning is necessary.

Below is a portion of Frigidaire's ® Installation Instructions for Gas & Electric Dryers state the following Exhaust System Requirements. It is important in that it points out the importance of monitoring pressure levels in the exhaust conduit of the dryer. The LintAlert is the most advanced, innovative and effective pressure sensing monitor for the dryer on the market today.

Use only 4 inch (10.2 cm) diameter (minimum) rigid or flexible metal duct and approved vent hood which has a swing-out damper(s) that open when the dryer is in operation. When the dryer stops, the dampers automatically close to prevent drafts and the entrance of insects and rodents. To avoid restricting the outlet, maintain a minimum of 12 inches (30.5 cm) clearance between the vent hood and the ground or any other obstruction.

In installations where the exhaust system is not described in the charts, the following method must be used to determine if the exhaust system is acceptable:

1. Connect an inclined or digital manometer between the dryer and the point the exhaust connects to the dryer.
2. Set the dryer timer and temperature to air fluff (cool down) and start the dryer.
3. Read the measurement on the manometer.
4. The system back pressure MUST NOT be higher than 0.75 inches of water column. If the system back pressure is less than 0.75 inches of water column, the system is acceptable. If the manometer reading is higher than 0.75 inches of water column, the system is too restrictive and the installation is unacceptable.

In our lab, we setup several circumstances of exhaust conduit layout that would represent the majority of conditions typically found in a North American setting. We also found that several factors in the mechanical design of the dryer appliance produce a medley of pressure levels. This multitude of circumstances creates a rather interesting spectrum of pressure level scenarios. The LintAlert through its onboard digital processor is able to determine your specific condition and then calculate increase intervals from there.

Please Note: Works on all dryers except those with dual motor technology and dryers that share exhaust systems like occasionally found in high-rise structures.

Resources:
Frigidaire's Installation Instructions page 3
Whirlpool Venting Guidelines page 5
Samsung Venting Guidelines page 9

Installation Manual
4-Minute Technical Demonstration Video