Click on the below images to download the guide:
HETAS Technical Bulletins
HETAS Technical bulletin 1(.pdf)
HETAS Technical bulletin 2(.pdf)
HETAS Technical bulletin 3(.pdf)
HETAS Technical bulletin 4(.pdf)
HETAS Technical bulletin 5(.pdf)
HETAS Technical bulletin 6(.pdf)
HETAS Technical bulletin 7(.pdf)
HETAS Technical bulletin 8(.pdf)
HETAS Technical bulletin 9(.pdf)
HETAS Technical bulletin 10(.pdf)
HETAS Technical bulletin 11(.pdf)
HETAS Technical bulletin 12(.pdf)