The louvre vent has been designed specifically for both our classic wooden and our RHS greenhouses and fits into any rectangular panel on the sides of the greenhouse. They could also be used for the plain end of the greenhouse as well. They are usually used to help in creating a draft within your greenhouse and can be repositioned if required very easily. As safety is our highest priority the louvre vent comes with four blades of toughened safety glass and the edges have been secured for safe handling. This product is especially popular for customers who look to grow alpines in their greenhouse.