AprilAire 5843 Manual-Control Humidifier Installation Kit

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Product guide

AprilAire 5843 Manual-Control Humidifier Installation Kit

AprilAire’s 5843 installation kit is listed for manual-control whole-home humidifiers in the 400M, 500M and 600M models. It bundles electrical, water-line, drain and bypass-duct components, so it may reduce separate parts sourcing, but the listing’s two-foot bypass duct length is worth comparing with your installation layout.

At a glance

Specified for AprilAire 400M, 500M and 600M humidifiers with manual control.
Kit components cover electrical connections, water supply and drainage, and bypass ducting.
The stated bypass flex duct length is 2 feet, which makes installation layout an important fit consideration.

Price

$41.99Save 50%

Reference price: ~~$83.99~~

Price checked: Nov 14, 2026

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Often bought together

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$19.92

AprilAire H635EZ1 Humidifier Filter/Water Panel Assembly Replacement Kit for AprilAire Whole-House Humidifier Models: 600, 600A, and 600M

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Pros and cons

Pros

Combines relay, wiring, plumbing tubing, connectors, ducting and mounting screws in one listed kit.
The 25-foot supply tube and 10-foot drain tube provide defined lengths for planning the installation.
Listed compatibility targets three manual-control AprilAire humidifier models.

Technical specifications

6 specifications

Identity
Brand	Aprilaire
Model	Whole-Home Humidifier Install Kit

Controls and power
Control methods listed	Touch
Power configuration	Corded Electric

Dimensions and installation
Dimensions listed	0.5"D x 120"W x 0.5"H

Materials
Material listed	Vinyl, Wire - Insulated Copper, Aluminum - Foil, Steel

What to know before buying

Listing details to confirm

The listing’s dimensions, color, evaporative operation, power and touch-control fields appear to describe a humidifier rather than this installation kit. Its 0 minute runtime is also inconsistent with a kit, so treat those details as unconfirmed. The listing specifies 2 feet of bypass duct, and customer feedback reports that the hose may be too short for some layouts. The stated compatible models are 400M, 500M and 600M with manual control.

What’s in the box

Included

Model 50 24V current sensing relay
10 feet of 18/2 thermostat wire
4 twist-on wire nut connectors
25 feet of 1/4-inch OD supply tube
10 feet of 1/2-inch ID drain tube
5/8-inch hose clamp
6-inch round duct collar
2 feet of 6-inch round bypass flex duct
Mounting screws

Who is it for?

A good fit for

Owners installing a listed AprilAire 400M, 500M or 600M manual-control whole-home humidifier who want the specified electrical, plumbing and bypass components together.
Buyers planning a furnace-duct installation who can confirm the included duct and tubing lengths suit their layout.

Less suited to

Installations using models or control types outside the listed 400M, 500M and 600M manual-control compatibility.
Buyers who need a bypass flex duct longer than the included 2 feet and do not plan to source additional ducting.

AprilAire 5843 Manual-Control Humidifier Installation Kit · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.2 / 5 · 144 ratings

5 stars62%62%
4 stars19%19%
3 stars9%9%
2 stars3%3%
1 star7%7%

Customer feedback describes the kit as helpful for whole-home humidifier installation, but views on quality, value and performance are mixed. A recurring practical concern is that the bypass hose may be too short. That matters because the listed flex duct is 2 feet, so buyers should compare that length with their furnace and humidifier layout before relying on the kit as a complete fit.

Positive themes

Feedback describes the kit as helpful for whole-home humidifier installation, and some customers say it works well.

Negative themes

Customers report that the bypass hose may not be long enough for their installation.

Mixed feedback

Customer perceptions of quality, value and performance are mixed.

Frequently asked questions

Which humidifiers is the AprilAire 5843 kit listed to fit?

The listing specifies AprilAire 400M, 500M and 600M whole-home humidifiers with manual control.

How long is the included bypass flex duct?

The listed contents include 2 feet of 6-inch round bypass flex duct. Customer feedback says the hose may be too short for some installations, so compare it with your planned route.

What kinds of installation parts are included?

The contents list includes a Model 50 current sensing relay, thermostat wire, wire nuts, supply and drain tubing, a hose clamp, a duct collar, bypass flex duct and mounting screws.

Does the kit include the humidifier?

The contents list names installation components, not a humidifier. The kit is described as being for installation of a compatible humidifier.