Skip to content

Free Gift Card Details

$100 Order

$10
gift card

$250 Order

$25
gift card

$500 Order

$50
gift card

$1000 Order

$100
gift card
  • The promotion will be automatically applied on the Shopping Cart page.
  • To qualify for this offer, your order subtotal must equal $100 or more. Excludes gift cards, free item offers, warranties, Advantage memberships, tax and shipping.
  • Free gift cards will be issued in the form of e-gift cards only, not physical gift cards.
  • E-gift cards will be sent to the email address used in your billing address when your order ships or is picked up.
  • Free e-gift cards expire 11/01/26.
  • Promo code not valid on prior purchases or on Honda and STIHL products and cannot be combined with other promotional offers.
  • Valid online and in participating retail stores.
  • Limited-time offer. Subject to change without notice.

Product Summary

The Category 3-Horizontal 4in. Vent Kit provides Class 3-single wall ducting for use with Mr. Heater Big Maxx unit heaters, ranging from 50,000, 80,000, 125,000, and 200,000 BTUs. Complies with US standard (UL1738) and Canadian standard (S636). Designed for horizontal installation only. Kit includes 4in. x 6-19in. adjustable pipe, 4in. x 12in. vent pipe, 4in. 45° elbow, 4in. wall thimble, 4in. termination tee, screws, and silicone. Stainless steel is required for horizontal installations per new category 3-certifications. Other parts may also be required for your specific installation needs. Please check and adhere to all state and local codes before installation.

What's Included

    (1) Vent Kit (2) 4 in. x 6-19 in. adjustable pipe (3) 4 in. x 12 in. vent pipe (4) 4 in. 45° elbow (5) 4 in. wall thimble (6) 4 in. termination tee (7) screws, and silicone.

Features + Benefits

  • Category 1 horizontal 4 in. vent kit for use with Mr. Heater Big Maxx brand unit heaters ranging from 50,000, 80,000, 125,000, and 200,000 BTUs
  • Stainless steel 4 in. sealed ducting meets new category 3-certifications
  • Complies with US standard (UL1738) and Canadian standard (S636)
  • Kit provides the pieces needed for an average installation - additional pieces may be needed
  • Compatible with models: MHU50, MHU80, MHU125, MHU200
  • Kit includes 4 in. x 6-19 in. adjustable pipe, 4 in. x 12 in. vent pipe, 4 in. 45° elbow, 4 in. wall thimble, 4 in. termination tee, screws, and silicone.

Key Specs

AttributeSpecification

item#

6905054

Brand

Mr. Heater

Manufacturer's Warranty

1 year limited warranty

Ship Weight

8.7 LB
AttributeSpecification

Included (qty.)

1

Product Weight

0.0000 lb

Dimensions L x W x H (in.)

0.0 x 0.0 x 0.0 in

Warranty

Manufacturer's Warranty

1 year limited warranty