Gas Appliances in Mobile Homes

28 November 2016

Reference #:  D-G5 081117 1 Rev 01

This directive is being issued by a provincial safety manager pursuant to section 30 of the Safety Standards Act.

General Details

This directive is being issued by British Columbia Safety Authority to clarify the application of the installation requirements for gas appliances installed in mobile homes as described in the CSA B149.1 clause 4.8.

Specific Details

The requirements for installing gas appliances in mobile homes and recreational vehicles are specified in CSA B149.1 Natural Gas/Propane Installation Code clause 4.8. The installation requirements are dependent on the whether the vehicle is used as a mobile home or a permanently fixed structure in accordance with the following definitions:            

Mobile home - a dwelling that consists of a vehicular portable structure built on a chassis and designed to be used with or without a permanent foundation and to be connected to indicated utilities.

Recreational vehicle - a portable structure intended as temporary accommodation for travel, vacation, or recreational use. Such a structure includes a chassis-mounted camper, motorized home, slide-in camper, tent trailer, or travel trailer.

Permanently fixed structure - upon removal of the method of transportation (towing mechanism, axles or wheels) and having been firmly secured to a permanent fixed method of support (foundation) a Mobile Home will be considered a permanent fixed structure.

Foundation - an underlying base or support; the masonry substructure of a building.

When a structure is classified as a mobile home CSA B149.1 section 4.8.1 states that all gas burning equipment and piping systems are certified/comply with CSA standard Z240.4.1. When a structure is classified as a recreational vehicle all gas burning equipment and piping systems are certified/comply with CSA standard Z240.4.2  Mobile homes and recreational vehicles pose special requirements for gas-burning appliance installations, hence the installation of gas-burning appliances and supply piping must be addressed under a separate standard. Due to the special requirements of these dwelling structure types it is important to confirm that installed and/or replacement appliances conform to the correct standard.

When mobile homes or recreation vehicles are converted into permanently fixed dwellings or structures, they are assumed to be like normal buildings, and therefore all applicable requirements of CSA B149.1 must be met. CSA B149.1 clause 4.8.2 indicates that all gas burning equipment and piping systems must be certified to comply with all applicable requirements of CSA B149.1 as indicated in 4.8.3. Although installed and/or replacement appliances are not required to be certified to standard CSA Z240.4.1, or CSA Z240.4.2 they must be installed in accordance with the manufacturer’s certified installation instructions.

In accordance with clause 4.8.2 appliances in permanently fixed mobile homes or recreational vehicles do not need to be certified for use in a mobile home or recreational vehicle. If a forced-air furnace is replaced with other than one certified for use in a mobile home, the ductwork design, sizing, and clearances must conform to the manufacturer’s certified installation instructions and allow the furnace to be adjusted to meet the manufacturer’s design criteria, including temperature rise and static pressure. Any furnace requiring a certified base for installation on a combustible floor shall only be installed on the base specified by the manufacturer.

Brad Wyatt
Provincial Safety Manager - Gas

References:
Safety Standards Act
Gas Safety Regulation
CSA B149.1 - Natural gas and propane installation code
CSA Z240 Standard MH Series - Manufactured homes
CSA Z240 Standard RV Series - Recreational Vehicles