According to the guidelines of HVI (Home Ventilating Institute) baths that are 100 sq.ft. or smaller require 1 cfm per square foot of bathroom or a minimum 50 cfm of fresh airflow. To find the square footage simply multiply the length of the bath by the width. Allow 50 cfm per standard tub, shower or toilet. Whirlpool, garden and jetted tubs are calculated at 100 cfm.
Example 1: Bathroom 9’ x 7’ = 63 sq.ft. you require the PB110 or PBW110.
Example 2: Bathroom 11’ x 14’ = 154 sq ft, 1 Toilet + 1 Shower + 1 Tub = 150 CFM you require the PB270L10-2. Note: HVI recommends that Steam Showers use a separate fan on a timer so that the fan may be shut off during shower use and then run afterwards to dry out the shower stall. For proper airflow in typical installations (when duct losses aren’t calculated) use the 0.4” Pst rating point for the correct fan selection. Bathroom doors need to have at least ¾” clearance to the finished floor to allow for make up air.
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Keep the duct runs as short as practical (under 25 feet). The inner core of Flexible Insulated Ducting should be as tight and straight as possible and sealed to the grille housing/fan/wye connector/termination with aluminum foil tape. Ensure there is a minimum of 3 duct diameters between any fitting and the inlet/outlet of the fan. For the PB270L10-2 and PB370-2: It is better to have a short run of larger trunk line from the wye connector to the inlet of the fan and from the fan outlet to the termination point and longer runs of smaller duct from the grille/light to the wye connector.
Fantech generally recommends that no more than 3 bathrooms be exhausted together. Whenever the fan runs, air will be exhausted from all the rooms that are connected to one system. This, in combination with the much higher cost of large fans, means that it is generally beneficial to exhaust a maximum of 3 smaller, or two larger, bathrooms together.
Static Pressure is a measure of resistance to airflow as a fan pushes or pulls air through a duct. It is measured in inches of water gauge, such as 0.1” w.g. to show the resistance is equal to raising a column of water 0.1” or one-tenth of an inch.
Both the LED and Halogen grille/lights are UL listed for wet locations. When installed over a tub or shower they must be connected to a GFCI (Ground Fault Circuit Interrupter) – protected branch circuit.
Yes, Fantech recommends that the light be on its own switch and the fan on a timer such as the Fantech FD60EM.
Yes, the grille/light units are Insulation Contact (IC) rated.
The Home Ventilating Institute (HVI) recommends running the fan for a minimum of 20 minutes after using the bathroom to completely exhaust moisture. Fantech offers a line of programmable and manual controls, switches and timers for your convenience.
Wiring the timers parallel as per the installation instructions will allow each timer to work independently.
Yes, the orientation of the fan will not affect its operation. When running horizontal duct to the outside it is advisable to slightly slope the duct down to the outside vent (this allows condensation (if any) to naturally run out of the duct).
When used with the Fantech Fan Control, your PB fan will provide a cost effective way to comply with code requirements for controlled ventilation in residential applications. Check out our VT20M/A bath fan switches.
Yes, All Fantech plastic grilles can be painted. A paint that is suitable for plastic should be used. An example of such paint is “Krylon Fusion for Plastic”. If a paint that is not suitable for plastic is to be used, a primer coat of paint that is suitable for plastic should be applied first. An example of such paint is “Rust-oleum Specialty Plastic Primer”. Paints that are not suitable for plastic that are applied directly to a plastic grille are not likely to yield satisfactory results. As with all painting processes, surface preparation (proper cleaning) and following the directions of the paint manufacturer are critical to the quality of the painted grille. The grille needs to be removed from the installation for painting. This will prevent paint from being applied to the lamp socket contacts, damper flap, or labels.
Fantech Premium Bath Fan Warranty is 7 years.
Any motion sensor that has a 120V output will operate the Fantech fan.
Four VT20A auxiliary controls can be used with one VT20M. This allows ventilation in areas such as bathrooms, laumdry rooms, workshops, etc. The VT20A is connected to the VT20M with 2 core insulated cable.
Fantech's PBW 110 comes with a ceiling grille and externally mounted fan. It's ideal for basement bathrooms, first floor powder rooms where the duct from the ceiling grille can be routed with the joist bay to an outside wall/fan.
Fantech makes air quality control easy thanks to decades of research, development, and refinement that continue to push the industry forward. Learn which Fantech solution is the best fit in your next project today.