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Panasonic WhisperGreen Continuous Operation Bathroom Fan with Lights - FV-13VKSL4 (replaces FV-13VKSL3) 

CFM: 50-130
Sones: < 0.3 to 0.3
CFM / Watt: 5.5 - 12.3
6 Year Warranty on DC Motor 

Duct Diameter (inches): 6"
Mounting Opening (inches sq.): 10 7/8" 
Grille Size (inches sq.): 13"
Overall Dimensions: (H x W x D) 13" x 13" x 7 2/5"
Lamp Watts: 2 x 13 with 4 watt night light (all bulbs included)

This fan is designed to run continuously ensuring a healthy climate at low CFM levels 24 hours a day. NOTE: This NEW model can also be configured for spot (non-continuous) ventilation!!This fan is also built to take care of the homeowners spot ventilation needs when the room is occupied. This fan kicks-up to a maximum level of 130 CFM when activated by standard switch. A High/Low Delay Timer, located inside the fan unit, is utilized to return the fan back to the pre-set continuous ventilation mode OR shut off completely

A NOTE ON SWITCHING THIS FAN:
There are a variety of ways that this fan can be switched. When contact with the high speed (red) wire is opened - the countdown begins to turn the fan down to the continuous operation (low) speed. As the wiring diagram indicates - it is also possible to introduce an additional switch to override the fan and turn it off altogether.  We have made a special "momentary contact" switch available to make the transition from low to high speed easy.

Constant CFM Performance
This WhisperGreenT model features built-in intelligence called SmartFlowT Optimum CFM Technology. This unique "electronic-brain" lets the fan do what was once thought to be impossible, perform at a constant CFM regardless of elbows and other factors that might hinder performance. Basically, when a WhisperGreenT fan faces static pressure, its speed is automatically increased to ensure that the desired CFM is actually achieved. This allows the fan to perform as rated and makes for easier installation because the installer no longer has to worry as much about compromising the fan's performance. Uses ultra energy-efficient DC motor.

DC Brushless Motor
Panasonic's DC brushless motor provides unparalleled energy efficiency with its magnetic rotor and print circuit board. The magnetic rotor prevents energy loss while the print circuit board incorporates a unique IC chip which monitors and directs the RPM of the fan blade. The combination of these two unique features allows the DC motor to have higher energy efficiency than an AC motor.

Variable Speed Control
This fan is equipped with a CustomVentT Variable Speed Control. This allows the fan to run continuously at a pre-set lower level of 50-130 CFMs that can then be elevated to a maximum of 130 CFMs when the switch is turned on. A High/Low delay timer(adjustable from 30 seconds - 60 minutes), will then return the fan to the minimum CFM level after a period of time set by the user.

So Quiet You Might Not Know it's On
This WhisperCeilingT model features a totally enclosed condenser motor and a large, double suction blower wheel to quietly move air. A small wheel turning very fast will create more noise than a large wheel turning more slowly for a given airflow. Our fan uses a wide blower wheel that moves a large amount of air at reduced RPMs. The blower wheel is also designed to draw air in from both sides, which helps keep the noise down, as there is more area for the air to enter the wheel. In fact, it is quiet enough that you might not even know it's on.

Continuous, Trouble-free Operation for Many Years
This fan is designed to give you continuous, trouble-free operation for many years thanks in part to its high-quality components and permanently lubricated motors which wear at a slower pace. Also, since heat is always detrimental to motor life (the cooler the environment, the longer the motor will last), we designed the electrical configuration of this model's condenser motor to allow it to operate at lower temperatures, increasing the life of the motor and bearings. And, the fan housing is made of heavy-gauge zinc galvanized steel and painted to protect it from rust.

User-Friendly Installation
Detachable adaptors, firmly secured duct ends, adjustable mounting brackets (up to 26"), fan/motor units that detach easily from the housing and uncomplicated wiring all lend themselves to user-friendly installation. This model also features a double-hanger bar system for ideal positioning.

Energy StarŪ Qualified for Energy Savings
Energy Star qualified products feature super-quiet operation and high CFM-to-Watt efficiency. The Energy Star program was created to help consumers identify products that can save them money and protect the environment by saving energy. As an Energy Star partner, all our fans are Energy Star qualified and labeled accordingly.

Tired of Cold Air Coming Through Your Ventilation Fan?
This Panasonic fan has a built-in damper to prevent backdraft, which helps to prevent outside air from coming through the fan. Also, thanks to our efficient, cool running motors and fluorescent bulbs, it does not create excessive heat-a common problem with recessed lighting fixtures and some competitors' fan/light combinations. Loose fill or batt insulation can be placed directly over the fan housing to prevent heat from escaping.