Update on TSSA Mandates for Natural Gas or Propane Heating Appliances in Livestock and Poultry Barns

In 2015, TSSA released mandates that included specific requirements for natural gas or propane heating appliances installed in livestock and poultry barns that vent their products of combustion into the barn space . Originally released with a January 1, 2016, deadline for compliance, the mandate deadline was retracted to allow Farm Owners to take the necessary steps to ensure compliance.

The most recent amendment to this mandate referenced as “Gaseous Fuels Code Adoption Document (FS-225-17, dated April 10, 2017, effective July 1, 2017)” regulates that these unvented heaters are interlocked with the ventilation system or if not interlocked, a proper ventilation is confirmed by calculations prominently displayed in the entrance area to each building housing livestock or poultry.

Within this amended mandate, new deadlines were announced for TSSA calculations to be completed for facilities with heaters installed prior to October 1, 2014, as follows:

(a) by July 1, 2019, when total building area housing livestock or poultry on the premise is over 25,000 square feet;

(b) by July 1, 2021 when total building area housing livestock or poultry on the premise is up to and including 25,000 square feet.

The calculations required for your heaters must be verified by a licensed professional engineer, licensed engineering technologist or other limited license holders, pursuant to the Professional Engineers Act. The PEO license holder must verify the following two (2) calculations:

  1. Minimum ventilation rate of the barn (mechanical or natural ventilation) when the heaters are operating is not less than 300 CFM / 100,000 BTUH (0.003 CFM/BTUH) of heaters input [clause 7.37.2(c)]

  2. Maximum input of the heating appliances does not exceed 20 BTUH/FT3 of the space in which the appliance is located [clause 7.37.2(d)]

The calculations summary must show at minimum the following information, keeping in mind that this form must reflect the current status whether heaters are added or removed and are operational or not.

  • Barn address

  • Barn ID

  • Barn description

  • Barn dimensions in feet

  • Barn volume in cubic feet

  • Description of heaters

  • Heaters input in BTUH (total input of all heaters)

  • Description of ventilation equipment

  • Minimum ventilation rate in CFM

  • Ratio of minimum ventilation rate to heaters input [shall not be less than 300 CFM / 100,000 BTUH (0.003 CFM/BTUH) as per clause 7.36.1(c)]

  • Ratio of heaters input to barn volume [shall not exceed 20 BTUH/FT3 as per clause 7.37.1(d)]

  • First/last name, PEO license number, and company name of the license holder that verified ventilation calculations

  • Date of verification

Once these calculations have been completed, Stonecrest Engineering recommends a site visit to verify the equipment in support of the required calculations. This is to verify that the minimum ventilation rate of the barn (mechanical or natural ventilation) when the heaters are operating is not less than 300 CFM / 100,000 BTUH (0.003 CFM/BTUH) of heaters input; and to ensure the maximum input of the heating appliances does not exceed 20 BTUH/FT3 of the space in which the appliance is located.

Ensuring compliance with the TSSA mandate now will ensure you continue to receive uninterrupted delivery of fuel. For more information, please refer to the attached Fuels Safety Program Advisory, or contact the TSSA Fuels Safety Program Technical Services at 1-877-682-8772 or email fuels_technical_services@tssa.org.


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