Uiga o oloa
1. Ventilation butterfly valve e fou ma talafeagai i le mamanu, tulaga ese i le fausaga, mama i le mamafa ma vave i le tatalaina ma le tapunia.
2. O le valve butterfly o loʻo i ai le lelei o le taimi faʻagaioia laʻititi, faʻaogaina faigofie ma le faʻapolopoloina o galuega.
3. Fa'aaogā mea talafeagai e fa'afetaui ai le vevela 'ese'ese o fa'asalalauga maualalo, feololo ma maualuga ma fa'asalalauga fa'a'a'a.
4. E leai ni faʻamau faʻafesoʻotaʻi, faʻamau, ma isi mea, faʻalagolago i le faʻaogaina, umi o le ola tautua, e le afaina i le tafega o ala o faasalalauga.