Fancoil unit sitting on 2 hour fire-resistance rated <a href="//commons.wikimedia.org/wiki/Concrete" title="Concrete">concrete</a> floor slab. <a href="//commons.wikimedia.org/w/index.php?title=Fibreglass&amp;action=edit&amp;redlink=1" class="new" title="Fibreglass (page does not exist)">Fibreglass</a> <a href="//commons.wikimedia.org/w/index.php?title=Pipe&amp;action=edit&amp;redlink=1" class="new" title="Pipe (page does not exist)">pipe</a> <a href="//commons.wikimedia.org/wiki/Thermal_insulation" title="Thermal insulation">covering</a> with ASJ (All Service Jacket = foil scrim kraft), butting up to <a href="//commons.wikimedia.org/wiki/Firestop" title="Firestop">firestop</a> consisting of <a href="//commons.wikimedia.org/wiki/Mortar_(firestop)" title="Mortar (firestop)">firestop mortar</a>. This interrupts the vapour barrier surrounding the pipe insulation. If the insulation were to traverse the firestop mortar intact, a better technical solution, one would use an approved intumescent layer within the firestop mortar to fill the space the fibreglass would leave behind when it is exposed to a fire, such as a firestop manufacturer must demonstrate in a <a href="//commons.wikimedia.org/wiki/Fire_test" title="Fire test">fire test</a>. Larger fancoil units can have up to 5 penetrating pipes. Usually fancoil units are located in apartments, in highrise buildings. the fancoil unit is responsible both for heating and cooling of each apartment. They are all connected in the building. In residential firestopping, these are typically the only rectangular openings. The rest are round, to allow for penetrating pipes and electrical conduit. The mortar here is held up by compressed rockwool. Often, firestoppers choose approved rubber coatings over top of the packing. Firestop mortar is more solid and is better at sound attenuation than any soft seals. Pipe motion can be absorbed through the use of approved slip covers, such as ceramic fibre "paper", for instance. Cooling insulation such as foamed plastic or rubber, as well as fibreglass require the use of intumescents, in case the vapour barrier traverses the seal. Rockwool pipe covering, as well as pre-moulded <a href="//commons.wikimedia.org/w/index.php?title=Vermiculite&amp;action=edit&amp;redlink=1" class="new" title="Vermiculite (page does not exist)">vermiculite</a>, <a href="//commons.wikimedia.org/w/index.php?title=Calcium_silicate&amp;action=edit&amp;redlink=1" class="new" title="Calcium silicate (page does not exist)">calcium silicate</a> and foamglass are  usually OK on their own, provided that they have been included at the time of test of the firestop, as each installed configuration must comply to maximum and minimum tolerances of the applicable certification listings upon which each firestop installation must be based, if it is to meet the local building code and fire code as well as insurance requirements.
<a href="//commons.wikimedia.org/wiki/User:Achim_Hering" title="User:Achim Hering">Achim Hering</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>