AND has a higher order of precedence than OR so your current WHERE clause can be written as
WHERE (active = 'A' AND Model = 'FOTNK') OR Model = 'LPTNK'
I suspect you want:
WHERE active = 'A' AND (Model = 'FOTNK' OR Model = 'LPTNK')
which reduces to:
WHERE active = 'A' AND Model IN ('FOTNK', 'LPTNK')