Large stainless refrigerator set flush between kitchen cabinets
7 components covered

Field manual · Range Hood

Best built-in hood inserts (PK22 / PKEX22 iQ12 and HBN22 True iQ successor): quick sheet

Covers: Best (Broan-NuTone premium brand) built-in power-pack inserts that mount inside a custom wood or plaster hood: PK2230 (27-3/4 in nominal 30), PK2239 (36-1/2 in, sold as 36/39) and PK2245 (43-7/16 in, sold as 45/48) with the internal dual iQ12 blower, and PKEX2239 / PKEX2245 versions with no internal blower (paired only with Best in-line ILB3/ILB6/ILB9/ILB11 or exterior EB6/EB9/EB12/EB15 blowers). PK22 is now listed by Best as discontinued; its successor is the HBN22 series (HBN223012SS, HBN223612SS, HBN224812SS) with the True iQ blower, touch slider, Wi-Fi/Bluetooth and SmartSense Pro. Model/spec label: inside the power pack (on HBN22 next to the HVI label, behind the filters); the replacement filter part number is on a label inside the power pack. Not covered: Best wall chimneys (WPP1, WC34IQ) and CP5/CP57 Potenza inserts, for which no fetchable manual was found. Search terms: Best PK22, PK2230, PK2239, PK2245, PKEX2239, iQ12 calibration, Best hood 4 speed lights flashing, Best HBN22, True iQ, Heat Sentry fan won't turn off.

Single sourceBrands: Best, Broan-NuTone7 components

A stainless power pack that the cabinetmaker or installer builds into a custom canopy. The PK22 carries two brushless DC (BLDC) blowers driven by one electronic drive and a pushbutton control with 4 fan speeds (speed 4 acts as the top / boost setting), 3 light levels, a 10-minute delay-off, a 25-hour filter-clean reminder and a Heat Sentry thermostat. Its iQ12 system has a one-time airflow calibration button that measures duct restriction after install. The HBN22 replacement keeps the 10 in. round vertical discharge and Heat Sentry but moves to an 8-speed capacitive slider, LED modules, a 30-hour filter reminder, automatic real-time airflow calibration, and Code Ready Technology (CRT) that can permanently cap airflow for make-up-air codes.

Safety first

  • Turn power off at the service panel and lock or tag it before servicing; the Heat Sentry can start the blower by itself.
  • Wiring must be done by qualified personnel; the unit must be grounded; use metal duct only and duct to the outdoors.
  • Do not use any solid-state speed control with these power packs.
  • Lamps get hot; let them cool before touching.
  • High-CFM hoods may need make-up air; check local code before raising airflow or after changing CRT settings.
  • Two people are recommended to lift the power pack (about 50-57 lb with internal blowers).

How it works

PK22: two 600 CFM BLDC blower wheels share one electronic drive board and a control interface board; a 120 V AC to 9 V DC transformer powers the low-voltage side. Air leaves through a 10 in. round adapter with a vertical backdraft damper (Best model 421) installed in the vertical duct, ideally 17 in. or more above the power pack.

iQ12 calibration (PK22 only, not PKEX22): after the duct, filters and lamps are installed, the installer holds the calibration button so the blower runs a measured cycle (up to about 13 minutes) and stores the result. A steady light at the end means rated airflow was reached; a blinking light means the duct is too restrictive and the drive defaults to maximum effort.

Heat Sentry: a thermostat in the power pack takes over the blower when it senses excess heat. On the PK22 it locks out speed 4 for 10 minutes and holds speed 3; on the HBN22 it raises the blower to high (Best lists about 200 F exhaust temperature as the trigger). It can start the fan even when the hood is off, and the fan buttons cannot stop it.

PKEX22 has no blower inside: it only carries controls, lights, filters and an autotransformer/fuse kit, and feeds a remote in-line or exterior Best blower through a male/female power connector pair. Only the listed Best blowers may be used; with the ILB3, ILB6 or EB6 the cooktop below must be rated 60,000 Btu/hr or less.

HBN22: a capacitive slider sets 8 fan speeds; the True iQ drive adjusts in real time to hold the rated 1240 TrueCFM despite restrictions; an IR/air-quality sensor runs AUTO (SmartSense) mode from cooktop heat, humidity and VOCs. CRT can cap maximum airflow at 300, 400 or 600 CFM for make-up-air code compliance, and that change cannot be undone.

Components & tests

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Large stainless refrigerator set flush between kitchen cabinets by Alex Qian, Pexels License

Diagnostic guides for this appliance

Guide · Range Hood

Water dripping from the range hood (condensation in the hood or duct, cold-weather backdraft)

Warm, humid cooking air condenses on cold hood surfaces and on ductwork running through a cold attic, wall or roof. Some condensation while boiling or steaming is normal. Steady dripping usually means weak capture or airflow (dirty filters, low speed, a stuck damper, a blocked cap), an uninsulated or too-long duct, or cold outside air leaking back in when the hood is off. Water that is clearly rain coming down the duct is a roof or cap problem.

6 steps ~45 minmoderate
Guide · Range Hood

Range hood over 400 CFM: does the job need makeup air? (IRC M1503.6 check before you sell the hood)

Under the IRC kitchen makeup-air section (M1503.6 in recent editions, M1503.4 in 2009), a hood able to exhaust more than 400 CFM needs makeup air at roughly the same rate, with at least one damper that is gravity or motorized and opens automatically when the hood runs. Recent editions apply it only when the home has a fuel-burning appliance inside the air barrier that is neither direct-vent nor mechanically drafted (e.g., a natural-draft water heater or a wood fireplace). States and cities amend this, so the local code office decides. This guide is a pre-sale and diagnosis check, not an HVAC design.

5 steps ~30 minmoderate
Guide · Range Hood

Choosing a range hood: CFM rule of thumb, hood width and mounting height

Rules of thumb used across the industry: for gas, about 100 CFM per 10,000 BTU of total burner output (total BTU divided by 100); for electric, about 100 CFM per linear foot of cooktop width (10 CFM per inch). Make the hood at least as wide as the cooktop, and wider (about 3 in each side) on gas and island installs. Mount it inside the height range in the hood's own installation instructions, because capture drops fast when a hood is mounted too high. Then check makeup air if the result is over 400 CFM.

5 steps ~20 mineasy

Other range hoods manuals

Manual · Range Hood

GE and GE Profile under-cabinet hoods (JVX3300 / JVX5300 / JVX5360 / PVX7300 / PVX7360): quick sheet

GE 30 and 36 in under-the-cabinet hoods covered by owner's manual 49-2001095: JVX3240 and JVX3300 (2-speed rocker controls, 200 CFM), JVX5300 / JVX5360 and JVX5305 / JVX5365 (4 speeds plus boost, 310 CFM, backlit buttons, halogen lights) and GE Profile PVX7300 / PVX7360 (4 speeds plus boost, 390 CFM, glass touch, LED, Chef Connect Bluetooth). Color suffixes: SJSS stainless, EJES slate, FJDS black slate, BJTS black stainless, DJWW/DJBB white or black. Model and serial label: on the inner wall of the hood. Search terms: GE JVX5300, GE JVX3300 hood, GE Profile PVX7300 Chef Connect pairing, GE hood fan not working lights work, WB02X11537 filter.

6 components7 common failuresGE, GE Profile
Manual · Range Hood

Broan Glacier BCSQ1 series (BCSQ130/BCSQ136) under-cabinet range hood: quick sheet

Broan Glacier BCSQ130SS (30 in) and BCSQ136 (36 in) and color versions. At least one retailer lists the BCSQ130SS as discontinued. The general Broan-NuTone under-cabinet sheet in the library covers older lines.

5 components3 common failuresBroan
Manual · Range Hood

Broan 41000 series (413001, 413004, 413023 and others) non-ducted under-cabinet hood: quick sheet

Broan 41000 series 30 in and 36 in non-ducted hoods (e.g., 413001 white, 413004 bisque, 413023 black, 413601 36 in white; check the label). Very common in apartments and rentals. Some versions are listed as discontinued.

4 components3 common failuresBroan
Best built-in hood inserts (PK22 / PKEX22 iQ12 and HBN22 True iQ successor): quick sheet · OnCall Tech