They spoke of the company keeping information about the dangerous gas emissions from nearby residents, the explosive potential of the kiln being kept from emergency services and residents finding out, after going to the manufacturer, that the kiln was a trial-and-error manufacturing experiment.
Green MP Catherine Delahunty, who organised the meeting, said "the people" had been kept out of the discussion for the past two years while the company had been "experimenting".
"If the industry wants to operate in a residential area they have a responsibility. They have to look after their workers but they also have to look after the people in the area.
"Nobody should ever go to work and get sick.
Joining her on the panel were Mr McNab, resident Warren Kohlis and environmental consultant Gordon Jackman.
Mr Jackman said in theory, TNT was very good practice. He explained that when pine was dried in the kiln a "whole range of gases was given off".
"The company is quite aware of the toxic nature of these chemicals. It's not good for workers to be exposed to these chemicals.
"The problem is trust; every time something happens the trust disappears and we need to rebuild that."
Emotions were high when Pan Pac managing director Doug Ducker spoke.
Mr Ducker said the company needed to communicate better with residents.
"We need to look for your trust or support to move forward.
"It is not our intent to harm anyone."
Resident Warren Kohlis said people had felt unwell since the mill had been failing.
"The kiln should be moved", he said. It was too close to residential areas and when it failed it came into residents' houses.
Last August tests showed levels of pollutants were well below recommended guidelines when the kiln was operating normally but acrolein and acetic acid levels could exceed standards if a burner used to eliminate noxious gases stopped working during kiln operation.
