Learn French: Le patron fait vérifier l'installation par le technicien. - The boss is having the installation checked by the technician.

L'installation is the noun form of the verb installer (to install). Instead of using a clunky verbal clause to explain the action—such as "what the technician installed" (ce que le technicien a installé)—nominalization packs that entire idea into a single noun. This makes the sentence more concise and professional, a hallmark of B2-level French.

Why are the verbs fait and vérifier placed right next to each other?

This is the causative faire construction, which is used when a subject causes an action to happen but doesn't do it themselves (to have something done). Here, Le patron (the boss) isn't checking the equipment; he is having someone else do it. This structure is always formed by conjugating faire and immediately following it with an infinitive, which is vérifier here.

Why do we use par to introduce the technician?

In a causative faire sentence, if there is a direct object receiving the action (here, l'installation), the person actually performing the action (the agent) must be introduced by the preposition par or à. Since the technician is the one physically doing the checking, we say par le technicien.

As a quick refresher, if we wanted to replace l'installation with a pronoun ("The boss is having it checked"), where would the pronoun go?