Manufacturers of wood fires in NZ are amongst the very best in the world for producing cleaner burning fireplaces through continuous development to achieve lower emissions at a favourable cost.
However, there is no point in having the best burning fire in the world if the fuel it is fed is totally unsuitable – (e.g. wet firewood, treated wood).
Legislation passed and adopted through the NES (National Environmental Standards) dictates that all wood fires when tested under recognised and nationally accepted standards, must not exceed 1.5gm of emissions for every kg of fuel burnt and have a thermal efficiency of 65% or better.
Every local authority in NZ must have an emissions policy with the minimum being the NES standard. Some authorities choose to have lower emissions targets and this is mainly due to geographical locations, where atmospheric inversions can be common place on still winter nights, the air hangs in a stagnated form not being able to be cleared by wind.
The other controlling factor for those who want clean burning wood fires, is a matter of whether they live in urban or rural locations. Rural locations are classed as land areas equal to or exceeding 2 Hectares (4.94 Acres). Rural areas do not need to comply with the same restrictions placed on urban locations for obvious reasons.