A burner for use with an induced draft furnace and which satisfies reduced nitrous oxide emission standards is disclosed. Some of the casing accessories of the present disclosure can include a mounting bracket to attach the accessory to a wall structure and a channel formed in part by a spacer that can be adjusted to adjust the channel width in order to encase components of multi-component wall systems that can vary in width from one installation to another. Tyrosines were observed to generally contribute to the allergenic properties of patatin proteins.