Expert help that stays with you

Whether you’re choosing one component or planning the whole room, small details can become expensive problems once installation begins. We know the products we sell and the questions to ask early, helping catch mismatched components, overlooked requirements, and installation issues while they are still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have assembled many of the saunas we sell, visited the manufacturers, and use these products every day. New customers and existing Sauna Marketplace sauna and heater owners can Book a Ben consultation.

Specs
Weight10.0 lbs
Dimensions4.0 × 23.2 × 24.0 in
Depth4″
ModelMounting Collar L
Part NumberH3016022
Included ComponentsInner Flange, Outer Flange, Cover Flange, Plinth Plate, Installation and Operation Manual, 5-Year Limited Warranty
Installation ManualInstallation Resources
Residential WarrantyLimited 5-Year Warranty
UPC4745090275346
FinishStainless steel
Wall thickness range4 in minimum to 6 in maximum
Wall typeNon-combustible wall only
OriginDesigned, engineered and made in Estonia
Includes

What Is Included

Includes the product and configuration selected above. Hardware, controls, stones, venting, and accessories are not included unless specifically listed.

See How It Fits for required and compatible products.

How It Fits

How This Product Fits the System

What it is used for

A heater-system accessory for the application shown above. Match the model, part number, dimensions, and installation instructions before ordering.

What to plan

  • Start with the heater, chimney, or control model—not brand alone—then confirm the accessory part number and configuration.
  • Optional accessories are not required unless the selected product or installation manual says otherwise.
  • Replacement and installation parts must follow the current system manual, clearances, and local code.

Products that use this item

This item is used by the following products.

Attachments
Gallery

HUUM Mounting Collar L | HIVE Flow LS Through-Wall Collar

Large stainless steel through-wall mounting collar for the HUUM HIVE Flow LS stove, adjustable for walls 4 to 6 in thick. For non-combustible walls only. HIVE Flow Mini LS uses the separate small collar.

Build Your Quote:

$416.00

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Built for these

What’s included

  • Inner flange
  • Outer flange
  • Flange for the sauna-room side
  • Plinth plate (needed only with HUUM protective bedding)
  • Installation and operation manual

What it does

The HUUM Mounting Collar L is designed for use with the HIVE Flow LS Sauna Stoves. This collar enhances the aesthetic of your sauna stove and integrates the stove with a non-combustible wall.

On an LS stove the firebox passes through the wall so wood can be loaded from outside the sauna room. The collar is what makes that penetration look finished on both faces. The catalog lists SKU as the stainless steel collar.

Non-combustible wall only

The manual is unambiguous: “The mounting collar of HIVE Flow LS heaters is designed for installation through a NON-COMBUSTIBLE wall,” with the added warning “Ensure that the flammable material wall does not protrude.”

Wall opening (HIVE Flow LS, from Table 1 of the manual)

Configuration A B C D
Flow LS on the floor 25.6 in 41.3 in 19 in 22 in
Flow LS with Protective Bedding 25.6 in 43.3 in 19 in 24.2 in

Fitting

  • Install the inner flange inside the outer flange with the supplied fasteners, then adjust to wall thickness: minimum position for a 4 in wall, maximum for a 6 in wall, or anywhere between. Tighten the nuts.
  • Remove the stove door and door lock bushing (and ideally the grid) before moving the stove through the opening.
  • Find the flange position and fix it with heat-resistant silicone compound (not included), or drill and screw into the wall material.
  • Refit the door and lock bushing, move the stove to its final position and check the door swings and locks freely.
  • Fit the cover on the sauna-room side with screws or heat-resistant silicone.

Specifications

Model Mounting Collar L
Part number H3016022
UPC 4745090275346
Assembled dimensions 23.2 in W x 4 in D x 24 in H
Finish Stainless steel
Weight 10 lb
Origin Designed, engineered and made in Estonia

The small collar for HIVE Flow Mini LS measures 21.2 in wide. Match the collar to the stove.

Often bought with the HUUM HIVE Flow Wood-Burning Sauna Stove | Mini, Full & LS

What customers building this room most often add alongside it.

Expert help that stays with you

Whether you’re choosing one component or planning the whole room, small details can become expensive problems once installation begins. We know the products we sell and the questions to ask early, helping catch mismatched components, overlooked requirements, and installation issues while they are still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have assembled many of the saunas we sell, visited the manufacturers, and use these products every day. New customers and existing Sauna Marketplace sauna and heater owners can Book a Ben consultation.

Specs
Weight10.0 lbs
Dimensions4.0 × 23.2 × 24.0 in
Depth4″
ModelMounting Collar L
Part NumberH3016022
Included ComponentsInner Flange, Outer Flange, Cover Flange, Plinth Plate, Installation and Operation Manual, 5-Year Limited Warranty
Installation ManualInstallation Resources
Residential WarrantyLimited 5-Year Warranty
UPC4745090275346
FinishStainless steel
Wall thickness range4 in minimum to 6 in maximum
Wall typeNon-combustible wall only
OriginDesigned, engineered and made in Estonia
Includes

What Is Included

Includes the product and configuration selected above. Hardware, controls, stones, venting, and accessories are not included unless specifically listed.

See How It Fits for required and compatible products.

How It Fits

How This Product Fits the System

What it is used for

A heater-system accessory for the application shown above. Match the model, part number, dimensions, and installation instructions before ordering.

What to plan

  • Start with the heater, chimney, or control model—not brand alone—then confirm the accessory part number and configuration.
  • Optional accessories are not required unless the selected product or installation manual says otherwise.
  • Replacement and installation parts must follow the current system manual, clearances, and local code.

Products that use this item

This item is used by the following products.

Attachments
Gallery

PLAN THE WHOLE SAUNA

The room and heater still have to work as one system.

Start with the room dimensions, then account for glass, masonry, insulation, ceiling height, required clearances, and available electrical service. That is how we move from a product that looks right to a sauna that heats evenly and comfortably.