Allon taga, allon kwari ko ragar allo na ƙarfe waya ne, fiberglass, ko sauran ragamar fiber na roba, wanda aka shimfiɗa a cikin firam na itace ko ƙarfe, an tsara shi don rufe buɗe taga. Babban manufarsa shine kiyaye ganye, tarkace, kwari, tsuntsaye, da sauran dabbobi daga shiga gini ko tsarin da aka zayyana kamar baranda, yayin da suke ba da izinin kwararar iska. Yawancin gidaje a Ostiraliya, Amurka da Kanada suna da allo akan duk windows masu aiki, waɗanda suka fi amfani. a yankunan da ke da yawan yawan sauro. A da, allon a Arewacin Amirka yawanci ana maye gurbinsu da gilashin gilashin gilashi a cikin hunturu, amma yanzu ana haɗa nau'o'in nau'i biyu a hade da hadari da tagogi na allo, wanda ke ba da damar gilashin da gilashin allo don zamewa sama kuma. kasa.