HMMIXWH – Rytons Mixed Box of Plastic Hit & Miss Ventilators

General Details

HMMIXWH – Rytons Mixed Box of Plastic Hit & Miss Ventilators

  • Handy box of 32 mixed size white plastic hit & miss ventilators with integral flyscreens.
  • 7no 9×3, 18no 9×6 and 7no 9×9 all bagged and barcoded for display.
  • U.V. stabilised to slow down the effects of sunlight.
  • Note: Hit & Miss Ventilators must not be used to supply combustion and cooling air to boilers, stoves and fires.


  • 9×3: 271mm L x 95mm H.
  • 9×6: 271mm L x 171mm H.
  • 9×9: 271mm L x 247mm H.

Free Area:

  • 9×3: 4,400mm² (44cm²) per unit.
  • 9×6: 8,600mm² (86cm²) per unit.
  • 9×9: 13,000mm² (130cm²) per unit.


  • White.


  • U.V. stabilised high impact polystyrene.


  • Detach flyscreen from front cover.  Fasten flyscreen over opening.  Align front cover with flyscreen and ‘snap’ into position.

Handling Information:

  • Box quantity: 32 number.
  • Box weight: 3.02kg.

Reference Material:

  • The Building Regulations 2000, Approved Document F.
  • The Building (Scotland) Regulations, Mandatory Standard 3.14.
  • The Building Regulations (Northern Ireland) 2000, Technical Booklet K.
  • British Standard BS 5250.