Looking at "b 4.5". current one is 4", to 3" pipes. other reviews/questions + product title indicate this is 4". is it 4" or 4.5"?

Always think pipe dimensions (the ID of the pipe) when dealing with pipe. The Rn2's top and bottom connections are 4.5" OD nominal which translates to 4" pipe. You use a 4x3 Flex Coupling with the Rn2 and 3" PVC pipe. The PVC vent pipe is usually 3" which translates to 3.5" OD x 3" ID Schedule 40 PVC.

how many square feet of basement with a sump pump will this service

Basing fan selection on square footage of a basement is not exact since air flows will vary based on many factors. But in most cases the RN2 should be fine up to about 2500 sq/ft. This is a 4" fan so using 4" pipe will give the best results.

Can this fan be on a switch and turned off when we are away?

As a radon professional, most of the fan failures I've seen in 20 years are when fans have been off for a period. Soil moisture coming out of the pipe and condensing on the metal parts (bearings) can ruin them. They seem to be good for at least 15 years running continuously when properly installed. If you have to shut it off, remove and store the fan and replace the space left by the fan with solid pipe so you don't have any other moisture issues. Shut off switches located near these fans is an NEC safety code requirement. Radon levels go right back up a few hours after turning a fan off and the converse is true.

The rn-1 is advertised on amazon as 90cfm. why does the sticker on my rn-1 say 130 cfm ?

I don’t know. I have a rn-2 fan which is 130 cfm.

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Fantech Rn2 Radon Mitigation Fan, 4.5 in Duct, 123 CFM, Residential System

Fantech Rn2 Radon Mitigation Fan, 4.5 in Duct, 123 CFM, Residential System

Product ID: 89052179

Details

Brand
FANTECH
Compatible Devices
Desktop
Cooling Method
Air
Material
Engineered
Maximum Rotational Speed
1500 rpm
Noise Level
25 db

💧Wet location rated

💨123 CFM airflow

🔇Ultra-quiet 25 dB noise

HK$3621

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Description

💨 Breathe easy with silent, powerful radon defense!

COMPACT LIGHTWEIGHT - Sleek 4.5” duct size and only 16 oz for easy, flexible mounting.
LEAK PROOF DURABILITY - Vibration welded seams ensure zero leaks and long-lasting performance.
VERSATILE INSTALLATION - Indoor, outdoor, or wet locations – install anywhere without compromise.
WHISPER QUIET OPERATION - At just 25 dB, it keeps your space peaceful while working hard.
POWERFUL 123 CFM AIRFLOW - Optimized for efficient radon mitigation with industry-leading suction.

The Fantech Rn2 Radon Mitigation Fan delivers a robust 123 CFM airflow at 0.50” static pressure, ensuring effective radon reduction. Engineered with vibration welded seams for leak-proof durability, it operates ultra-quietly at 25 dB and is rated for indoor, outdoor, and wet location installations. Compact and lightweight, this 4.5-inch duct fan is a trusted choice for residential radon mitigation systems.

Specifications

ASIN	B07F6ZYG3B
Air Flow Capacity	220 cfm
Best Sellers Rank	#161,418 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #652 in Household Ventilation Fans
Brand Name	FANTECH
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.5 4.5 out of 5 stars (479)
Global Trade Identification Number	00650737890520
Item Dimensions L x W x H	13.25"L x 13.25"W x 11"H
Item Type Name	Radon Fan - 4.5" Duct - 123 cfm
Item Weight	16 ounces
Manufacturer	Fantech
Material Type	Engineered Plastic
Maximum Rotational Speed	1500 rpm
Model	Rn2
Noise Level	25 db
Number of Items	1
Number of Packs	1
Part Number	Rn2
Power Connector Type	4-Pin
UPC	650737020903 650737890520
Unit Count	1 Count
Voltage	12 volts
Wattage	58 watts

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HK$3621

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

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