HM43F – Rytons 9×3 Hit & Miss Ventilator

General Details

HM43F – Rytons 9×3 Hit & Miss Ventilator

  • Plastic hit & miss grille with integral flyscreen.
  • Manually adjusted for controllable ventilation.
  • Flush face, slim design and concealed fixings give a neat unobtrusive appearance.
  • Integral flyscreen helps prevent the ingress of insects and spiders as well as reducing light and draughts.
  • Compatible with Rytons 9×3 AirLiner® cavity liners.
  • 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.

Free Area:

  • 4,400mm² (44cm²) per unit.


  • 271mm L x 95mm H (see image gallery above).
  • CAD drawing available by email.


  • White: HM43F (bagged HM43FBG).
  • Colour matching available using the Tailor-made by Rytons bespoke ventilation service.


  • U.V. stabilised high impact polystyrene.


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

Handling Information:

  • Box quantity: 25 number.
  • Box size: 28cm W x 19cm H x 11cm D.
  • Box weight: 1.5kg.

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.

NBS Specification: