Additional Features4 large roof windows provide ample ventilationIncludes 4 automatic roof window openersConstructed with 16 MM twin wall polycarbonate glazingBetter insulation stability and quality than others in its classHas an array of accessoriesIncludes a big red heater with a thermostatAlso includes a solar light top shelf and a regular shelfBoth shelf inserts use twin polycarbonateInserts are removable to make room for taller plantsTwin polycarbonate allows for better light distributionYour choice of 10 plastic or stainless steel hooksPlastic hooks allow for grow string for tomatoes or beansStainless steel hooks will allow you to string lightsFeatures 283 square feet of spaceDoor measures 37.5W x 74H inchesPeak height measures 10 feetMeasures 14.1W x 19.8L x 10H feetBeautifully and expertly crafted the RIGA XL 14.1 x 19.8-Foot Greenhouse Kit comes with everything you need to make a thriving environment for your plants. You'll be able to grow plants vegetables and flowers year-round in this greenhouse which has better insulation stability and strength than others in its class. The thick aluminum profiles are permanently attached so they won't loosen over time and the entire greenhouse features 16 MM twin wall polycarbonate glazing for added strength and protection. The greenhouse has two large Dutch style doors and four roof windows which allow for optimal ventilation. The greenhouse also comes with four automatic roof openers. The RIGA XL is designed to allow maximum headroom with no eaves so you can assemble the greenhouse without the help of professionals.The RIGA XL Greenhouse Kit includes a "big red" heater with a thermostat a solar light that attaches to the top of the greenhouse a top shelf a regular shelf and your choice of 10 plastic or stainless steel hooks. The shelf inserts also have polycarbonate glaze for better light distribution and the inserts are removable to allow room for larger plants. The top shelf leans downward making it easier to reach and also to keep it from blocking the sunlight. The 10 plastic hooks are perfect for grow string for tomatoes or string beans while the 10 stainless steel hooks will allow you to hang lights throughout the greenhouse. The RIGA XL Greenhouse Kit will let you enjoy your favorite plants vegetables and flowers throughout the year. Assembly is a weekend project for one or two people.About HoklarthermAfter erecting his first greenhouse the "thermo semicular arch greenhouse " in his family garden in 1978 Mr. Werner Hollander graduate engineer founded Hoklartherm in 1982. Mr. Hollander's social circle was very interested in his greenhouse and more models followed quickly after. Today Hoklartherm is the biggest manufacturer of high-quality greenhouses made in Germany. Hoklartherm is in the business of developing ideas made of metal and glass for your house yard and garden. For over 20 years they have developed and produced greenhouses winter gardens pool houses pavilions terrace roofings solar verandas and much more. They take pride in innovation and creativity.