Three men found guilty for their involvement in a methamphetamine drug ring have been sentenced to jail.

Karl Rodney Goldsbury, 39 from Maketu, was sentenced to 10 years and six months in jail with a minimum non-parole period of five years, when he appeared in the High Court in Rotorua.

Karl Goldsbury was sentenced to 10 years in jail this morning.

Ryan David Carroll, 34 from Judea, and Terrance William Jones, 30 from Katikati received a three-and-a-half year jail term.

Tracey Angela Farrow, 28, also of Katikati, was placed on home detention for a year and ordered to do 200 hours' community work.

All three were arrested following the explosion of a former KingKat building in Katikati in 2012.

Goldsbury was found guilty of one count of attempting to pervert the course of justice, possession of iodine, conspiring to manufacture methamphetamine, supplying methamphetamine and supplying hypophosphorous acid used in the manufacture of methamphetamine following a trial earlier this year.

The jury of 12 acquitted him of one count each of manufacturing methamphetamine, arson and conspiring to supply methamphetamine.

Carroll and Jones were found guilty of conspiring to manufacture methamphetamine.

Jones was also found guilty of attempting to pervert the court of justice – an offence he was jointly charged with Goldsbury for.

At the start of the trial, Jones pleaded guilty to one count of offering to supply.

Farrow was found guilty of conspiring to supply P and offering to supply it to her sister.

Mark Kimber, 49, from Hairini, and Simon Whare, 40, from Te Puke, were both acquitted of supplying methamphetamine and manufacturing P.

The charges stem from incidents in 2012, when a P-lab at a Katikati property was set alight during an armed police raid on December 9.

The former KingKat factory burst into flames with neighbours reporting hearing loud bangs before seeing balls of smoke coming from the property at the time of the incident.

Police say the fire was lit deliberately by three occupants of the Park Road property.

More than 20 firefighters spent around five hours trying to get the blaze under control.

Three days after the fire, police executed search warrants in Maketu, Te Puke and Tauranga in relation to Operation Detroit.

Read more about the operation here.

The former KingKat building in Katikati exploded in 2012.